11212121430 has 96 divisors (see below), whose sum is σ = 29921452704. Its totient is φ = 2911362048.

The previous prime is 11212121399. The next prime is 11212121461. The reversal of 11212121430 is 3412121211.

11212121430 is a `hidden beast` number, since 1 + 1 + 21 + 212 + 1 + 430 = 666.

11212121430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11212121399) and next prime (11212121461).

It is a super-2 number, since 2×11212121430² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1299892 + ... + 1308488.

It is an arithmetic number, because the mean of its divisors is an integer number (311681799).

Almost surely, 2^11212121430 is an apocalyptic number.

11212121430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11212121430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14960726352).

11212121430 is an abundant number, since it is smaller than the sum of its proper divisors (18709331274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11212121430 is a wasteful number, since it uses less digits than its factorization.

11212121430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8990 (or 8987 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 11212121430 its reverse (3412121211), we get a palindrome (14624242641).

The spelling of 11212121430 in words is "eleven billion, two hundred twelve million, one hundred twenty-one thousand, four hundred thirty".