21013231031232 has 224 divisors, whose sum is σ = 62092885029120. Its totient is φ = 6216499322880.

The previous prime is 21013231031161. The next prime is 21013231031357. The reversal of 21013231031232 is 23213013231012.

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

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, 187842388 + ... + 187954220.

Almost surely, 2^{21013231031232} is an apocalyptic number.

21013231031232 is a gapful number since it is divisible by the number (22) 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 21013231031232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31046442514560).

21013231031232 is an abundant number, since it is smaller than the sum of its proper divisors (41079653997888).

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

21013231031232 is a wasteful number, since it uses less digits than its factorization.

21013231031232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113971 (or 113961 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21013231031232 its reverse (23213013231012), we get a palindrome (44226244262244).

The spelling of 21013231031232 in words is "twenty-one trillion, thirteen billion, two hundred thirty-one million, thirty-one thousand, two hundred thirty-two".