21415952158 has 8 divisors (see below), whose sum is σ = 32530560480. Its totient is φ = 10572432000.

The previous prime is 21415952143. The next prime is 21415952171. The reversal of 21415952158 is 85125951412.

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, 67771843 + ... + 67772158.

It is an arithmetic number, because the mean of its divisors is an integer number (4066320060).

Almost surely, 2^21415952158 is an apocalyptic number.

21415952158 is a deficient number, since it is larger than the sum of its proper divisors (11114608322).

21415952158 is a wasteful number, since it uses less digits than its factorization.

21415952158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135544082.

The product of its digits is 144000, while the sum is 43.

The spelling of 21415952158 in words is "twenty-one billion, four hundred fifteen million, nine hundred fifty-two thousand, one hundred fifty-eight".