21891811152552 has 96 divisors (see below), whose sum is σ = 60158782652640. Its totient is φ = 6633713116800.

The previous prime is 21891811152529. The next prime is 21891811152569. The reversal of 21891811152552 is 25525111819812.

It is a happy number.

It is a super-2 number, since 2×21891811152552² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21891811152495 and 21891811152504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159573027 + ... + 159710157.

It is an arithmetic number, because the mean of its divisors is an integer number (626653985965).

Almost surely, 2^{21891811152552} is an apocalyptic number.

21891811152552 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21891811152552 is an abundant number, since it is smaller than the sum of its proper divisors (38266971500088).

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

21891811152552 is a wasteful number, since it uses less digits than its factorization.

21891811152552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192135 (or 192120 counting only the distinct ones).

The product of its digits is 576000, while the sum is 51.

The spelling of 21891811152552 in words is "twenty-one trillion, eight hundred ninety-one billion, eight hundred eleven million, one hundred fifty-two thousand, five hundred fifty-two".