21085458588 has 36 divisors (see below), whose sum is σ = 53638854360. Its totient is φ = 6983716896.

The previous prime is 21085458551. The next prime is 21085458593. The reversal of 21085458588 is 88585458012.

21085458588 is a `hidden beast` number, since 2 + 1 + 0 + 8 + 5 + 4 + 58 + 588 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1859658 + ... + 1870961.

Almost surely, 2^21085458588 is an apocalyptic number.

It is an amenable number.

21085458588 is an abundant number, since it is smaller than the sum of its proper divisors (32553395772).

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

21085458588 is a wasteful number, since it uses less digits than its factorization.

21085458588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3730786 (or 3730781 counting only the distinct ones).

The product of its (nonzero) digits is 4096000, while the sum is 54.

The spelling of 21085458588 in words is "twenty-one billion, eighty-five million, four hundred fifty-eight thousand, five hundred eighty-eight".