21552099273936 has 240 divisors, whose sum is σ = 75207244963968. Its totient is φ = 5597341516800.

The previous prime is 21552099273919. The next prime is 21552099273953. The reversal of 21552099273936 is 63937299025512.

It is a happy number.

21552099273936 is a `hidden beast` number, since 2 + 1 + 5 + 520 + 9 + 9 + 2 + 73 + 9 + 36 = 666.

It is an interprime number because it is at equal distance from previous prime (21552099273919) and next prime (21552099273953).

It is a super-2 number, since 2×21552099273936² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 107198146 + ... + 107399006.

Almost surely, 2^{21552099273936} 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 21552099273936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37603622481984).

21552099273936 is an abundant number, since it is smaller than the sum of its proper divisors (53655145690032).

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

21552099273936 is a wasteful number, since it uses less digits than its factorization.

21552099273936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210570 (or 210561 counting only the distinct ones).

The product of its (nonzero) digits is 55112400, while the sum is 63.

The spelling of 21552099273936 in words is "twenty-one trillion, five hundred fifty-two billion, ninety-nine million, two hundred seventy-three thousand, nine hundred thirty-six".