21641152968 has 60 divisors (see below), whose sum is σ = 60625757115. Its totient is φ = 7212469392.

The previous prime is 21641152957. The next prime is 21641152993. The reversal of 21641152968 is 86925114612.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

21641152968 is a `hidden beast` number, since 2 + 1 + 64 + 1 + 1 + 529 + 68 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10820576484 + 10820576484 = 104022^2 + 104022^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=104022.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3741903 + ... + 3747681.

Almost surely, 2^21641152968 is an apocalyptic number.

It is an amenable number.

21641152968 is an abundant number, since it is smaller than the sum of its proper divisors (38984604147).

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

21641152968 is an frugal number, since it uses more digits than its factorization.

21641152968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11576 (or 5784 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 21641152968 in words is "twenty-one billion, six hundred forty-one million, one hundred fifty-two thousand, nine hundred sixty-eight".