211211330424 has 128 divisors (see below), whose sum is σ = 549327744000. Its totient is φ = 67623987200.

The previous prime is 211211330417. The next prime is 211211330431. The reversal of 211211330424 is 424033112112.

It is an interprime number because it is at equal distance from previous prime (211211330417) and next prime (211211330431).

It is a super-2 number, since 2×211211330424² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 211211330394 and 211211330403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20925619 + ... + 20935709.

It is an arithmetic number, because the mean of its divisors is an integer number (4291623000).

Almost surely, 2^211211330424 is an apocalyptic number.

211211330424 is a gapful number since it is divisible by the number (24) 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 211211330424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274663872000).

211211330424 is an abundant number, since it is smaller than the sum of its proper divisors (338116413576).

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

211211330424 is a wasteful number, since it uses less digits than its factorization.

211211330424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10469 (or 10465 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 211211330424 its reverse (424033112112), we get a palindrome (635244442536).

The spelling of 211211330424 in words is "two hundred eleven billion, two hundred eleven million, three hundred thirty thousand, four hundred twenty-four".