21221523652032 has 252 divisors, whose sum is σ = 66869690039880. Its totient is φ = 6429848325120.

The previous prime is 21221523651983. The next prime is 21221523652061. The reversal of 21221523652032 is 23025632512212.

It is a happy number.

21221523652032 is a `hidden beast` number, since 2 + 1 + 2 + 21 + 52 + 36 + 520 + 32 = 666.

It is a super-2 number, since 2×21221523652032² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 613516594 + ... + 613551182.

Almost surely, 2^{21221523652032} is an apocalyptic number.

21221523652032 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 21221523652032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33434845019940).

21221523652032 is an abundant number, since it is smaller than the sum of its proper divisors (45648166387848).

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

21221523652032 is a wasteful number, since it uses less digits than its factorization.

21221523652032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43432 (or 43408 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 21221523652032 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred twenty-three million, six hundred fifty-two thousand, thirty-two".