21060711656 has 32 divisors (see below), whose sum is σ = 41266938240. Its totient is φ = 10066616448.

The previous prime is 21060711643. The next prime is 21060711809. The reversal of 21060711656 is 65611706012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635141 + ... + 667476.

It is an arithmetic number, because the mean of its divisors is an integer number (1289591820).

Almost surely, 2^21060711656 is an apocalyptic number.

It is an amenable number.

21060711656 is a deficient number, since it is larger than the sum of its proper divisors (20206226584).

21060711656 is a wasteful number, since it uses less digits than its factorization.

21060711656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302713 (or 1302709 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 21060711656 in words is "twenty-one billion, sixty million, seven hundred eleven thousand, six hundred fifty-six".