21181159158 has 32 divisors (see below), whose sum is σ = 43646474592. Its totient is φ = 6848352000.

The previous prime is 21181159141. The next prime is 21181159243. The reversal of 21181159158 is 85195118112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206293 + ... + 291408.

It is an arithmetic number, because the mean of its divisors is an integer number (1363952331).

Almost surely, 2^21181159158 is an apocalyptic number.

21181159158 is an abundant number, since it is smaller than the sum of its proper divisors (22465315434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21181159158 is a wasteful number, since it uses less digits than its factorization.

21181159158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497920.

The product of its digits is 28800, while the sum is 42.

The spelling of 21181159158 in words is "twenty-one billion, one hundred eighty-one million, one hundred fifty-nine thousand, one hundred fifty-eight".