11231212664 has 64 divisors (see below), whose sum is σ = 25415769600. Its totient is φ = 4545244800.

The previous prime is 11231212661. The next prime is 11231212703. The reversal of 11231212664 is 46621213211.

It is a super-2 number, since 2×11231212664² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231212661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313934 + ... + 347874.

It is an arithmetic number, because the mean of its divisors is an integer number (397121400).

Almost surely, 2^11231212664 is an apocalyptic number.

11231212664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11231212664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12707884800).

11231212664 is an abundant number, since it is smaller than the sum of its proper divisors (14184556936).

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

11231212664 is a wasteful number, since it uses less digits than its factorization.

11231212664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34284 (or 34280 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

Adding to 11231212664 its reverse (46621213211), we get a palindrome (57852425875).

The spelling of 11231212664 in words is "eleven billion, two hundred thirty-one million, two hundred twelve thousand, six hundred sixty-four".