21613158 has 48 divisors (see below), whose sum is σ = 53782560. Its totient is φ = 6144768.

The previous prime is 21613157. The next prime is 21613177. The reversal of 21613158 is 85131612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42208 + ... + 42716.

It is an arithmetic number, because the mean of its divisors is an integer number (1120470).

Almost surely, 2^21613158 is an apocalyptic number.

21613158 is an abundant number, since it is smaller than the sum of its proper divisors (32169402).

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

21613158 is a wasteful number, since it uses less digits than its factorization.

21613158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 858 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 21613158 is about 4648.9953753472. The cubic root of 21613158 is about 278.5518685618.

The spelling of 21613158 in words is "twenty-one million, six hundred thirteen thousand, one hundred fifty-eight".