21157023598 has 8 divisors (see below), whose sum is σ = 31736348208. Its totient is φ = 10578240864.

The previous prime is 21157023571. The next prime is 21157023611. The reversal of 21157023598 is 89532075112.

It is a happy number.

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

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, 17211 + ... + 206422.

It is an arithmetic number, because the mean of its divisors is an integer number (3967043526).

Almost surely, 2^21157023598 is an apocalyptic number.

21157023598 is a deficient number, since it is larger than the sum of its proper divisors (10579324610).

21157023598 is a wasteful number, since it uses less digits than its factorization.

21157023598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270938.

The product of its (nonzero) digits is 151200, while the sum is 43.

The spelling of 21157023598 in words is "twenty-one billion, one hundred fifty-seven million, twenty-three thousand, five hundred ninety-eight".