21226957928532 has 288 divisors, whose sum is σ = 60550644510720. Its totient is φ = 6236351066880.

The previous prime is 21226957928489. The next prime is 21226957928549. The reversal of 21226957928532 is 23582975962212.

It is a happy number.

21226957928532 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 6 + 9 + 5 + 7 + 92 + 8 + 532 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21226957928532.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2597836807 + ... + 2597844977.

It is an arithmetic number, because the mean of its divisors is an integer number (210245293440).

Almost surely, 2^{21226957928532} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21226957928532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30275322255360).

21226957928532 is an abundant number, since it is smaller than the sum of its proper divisors (39323686582188).

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

21226957928532 is a wasteful number, since it uses less digits than its factorization.

21226957928532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12723 (or 12718 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 63.

The spelling of 21226957928532 in words is "twenty-one trillion, two hundred twenty-six billion, nine hundred fifty-seven million, nine hundred twenty-eight thousand, five hundred thirty-two".