21137158 has 32 divisors (see below), whose sum is σ = 38419200. Its totient is φ = 8519904.

The previous prime is 21137153. The next prime is 21137159. The reversal of 21137158 is 85173112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21137153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60741 + ... + 61087.

It is an arithmetic number, because the mean of its divisors is an integer number (1200600).

Almost surely, 2^21137158 is an apocalyptic number.

21137158 is a deficient number, since it is larger than the sum of its proper divisors (17282042).

21137158 is a wasteful number, since it uses less digits than its factorization.

21137158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604.

The product of its digits is 1680, while the sum is 28.

The square root of 21137158 is about 4597.5165035049. The cubic root of 21137158 is about 276.4917631320.

The spelling of 21137158 in words is "twenty-one million, one hundred thirty-seven thousand, one hundred fifty-eight".