21137592458 has 8 divisors (see below), whose sum is σ = 31721572740. Its totient is φ = 10563734880.

The previous prime is 21137592439. The next prime is 21137592521. The reversal of 21137592458 is 85429573112.

It can be written as a sum of positive squares in 2 ways, for example, as 18480499249 + 2657093209 = 135943^2 + 51547^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 2525453 + ... + 2533808.

Almost surely, 2^21137592458 is an apocalyptic number.

21137592458 is a deficient number, since it is larger than the sum of its proper divisors (10583980282).

21137592458 is a wasteful number, since it uses less digits than its factorization.

21137592458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5061352.

The product of its digits is 604800, while the sum is 47.

The spelling of 21137592458 in words is "twenty-one billion, one hundred thirty-seven million, five hundred ninety-two thousand, four hundred fifty-eight".