21064690288 has 20 divisors (see below), whose sum is σ = 40876329928. Its totient is φ = 10515960000.

The previous prime is 21064690249. The next prime is 21064690301. The reversal of 21064690288 is 88209646012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1013463 + ... + 1034038.

Almost surely, 2^21064690288 is an apocalyptic number.

It is an amenable number.

21064690288 is a deficient number, since it is larger than the sum of its proper divisors (19811639640).

21064690288 is a wasteful number, since it uses less digits than its factorization.

21064690288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048152 (or 2048146 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 21064690288 in words is "twenty-one billion, sixty-four million, six hundred ninety thousand, two hundred eighty-eight".