21137468 has 24 divisors (see below), whose sum is σ = 41341104. Its totient is φ = 9372800.

The previous prime is 21137461. The next prime is 21137489. The reversal of 21137468 is 86473112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21137461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4055 + ... + 7662.

It is an arithmetic number, because the mean of its divisors is an integer number (1722546).

Almost surely, 2^21137468 is an apocalyptic number.

It is an amenable number.

21137468 is a deficient number, since it is larger than the sum of its proper divisors (20203636).

21137468 is a wasteful number, since it uses less digits than its factorization.

21137468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11773 (or 11771 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 21137468 is about 4597.5502172353. The cubic root of 21137468 is about 276.4931148121.

The spelling of 21137468 in words is "twenty-one million, one hundred thirty-seven thousand, four hundred sixty-eight".