21571690632 has 32 divisors (see below), whose sum is σ = 55183397280. Its totient is φ = 7023340800.

The previous prime is 21571690631. The next prime is 21571690669. The reversal of 21571690632 is 23609617512.

It is not an unprimeable number, because it can be changed into a prime (21571690631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10450369 + ... + 10452432.

It is an arithmetic number, because the mean of its divisors is an integer number (1724481165).

Almost surely, 2^21571690632 is an apocalyptic number.

It is an amenable number.

21571690632 is an abundant number, since it is smaller than the sum of its proper divisors (33611706648).

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

21571690632 is a wasteful number, since it uses less digits than its factorization.

21571690632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20902853 (or 20902849 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The spelling of 21571690632 in words is "twenty-one billion, five hundred seventy-one million, six hundred ninety thousand, six hundred thirty-two".