21121158 has 32 divisors (see below), whose sum is σ = 43110144. Its totient is φ = 6897632.

The previous prime is 21121129. The next prime is 21121171. The reversal of 21121158 is 85112112.

It is a super-2 number, since 2×21121158² = 892206630521928, which contains 22 as substring.

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, 107116 + ... + 107312.

It is an arithmetic number, because the mean of its divisors is an integer number (1347192).

Almost surely, 2^21121158 is an apocalyptic number.

21121158 is an abundant number, since it is smaller than the sum of its proper divisors (21988986).

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

21121158 is a wasteful number, since it uses less digits than its factorization.

21121158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476.

The product of its digits is 160, while the sum is 21.

The square root of 21121158 is about 4595.7761042070. The cubic root of 21121158 is about 276.4219810463.

The spelling of 21121158 in words is "twenty-one million, one hundred twenty-one thousand, one hundred fifty-eight".