21097387858 has 16 divisors (see below), whose sum is σ = 31923434880. Its totient is φ = 10456615696.

The previous prime is 21097387847. The next prime is 21097387873. The reversal of 21097387858 is 85878379012.

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, 20535 + ... + 206437.

It is an arithmetic number, because the mean of its divisors is an integer number (1995214680).

Almost surely, 2^21097387858 is an apocalyptic number.

21097387858 is a deficient number, since it is larger than the sum of its proper divisors (10826047022).

21097387858 is a wasteful number, since it uses less digits than its factorization.

21097387858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186401.

The product of its (nonzero) digits is 6773760, while the sum is 58.

The spelling of 21097387858 in words is "twenty-one billion, ninety-seven million, three hundred eighty-seven thousand, eight hundred fifty-eight".