21292728158 has 8 divisors (see below), whose sum is σ = 34395945528. Its totient is φ = 9827412984.

The previous prime is 21292728139. The next prime is 21292728161. The reversal of 21292728158 is 85182729212.

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, 409475516 + ... + 409475567.

It is an arithmetic number, because the mean of its divisors is an integer number (4299493191).

Almost surely, 2^21292728158 is an apocalyptic number.

21292728158 is a deficient number, since it is larger than the sum of its proper divisors (13103217370).

21292728158 is a wasteful number, since it uses less digits than its factorization.

21292728158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818951098.

The product of its digits is 322560, while the sum is 47.

The spelling of 21292728158 in words is "twenty-one billion, two hundred ninety-two million, seven hundred twenty-eight thousand, one hundred fifty-eight".