21006525006 has 12 divisors (see below), whose sum is σ = 45514137552. Its totient is φ = 7002174996.

The previous prime is 21006524983. The next prime is 21006525091. The reversal of 21006525006 is 60052560012.

21006525006 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 652 + 5 + 0 + 0 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 583514566 + ... + 583514601.

It is an arithmetic number, because the mean of its divisors is an integer number (3792844796).

Almost surely, 2^21006525006 is an apocalyptic number.

21006525006 is an abundant number, since it is smaller than the sum of its proper divisors (24507612546).

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

21006525006 is a wasteful number, since it uses less digits than its factorization.

21006525006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167029175 (or 1167029172 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 21006525006 in words is "twenty-one billion, six million, five hundred twenty-five thousand, six".