21137374 has 8 divisors (see below), whose sum is σ = 31948488. Its totient is φ = 10487880.

The previous prime is 21137371. The next prime is 21137377. The reversal of 21137374 is 47373112.

It is an interprime number because it is at equal distance from previous prime (21137371) and next prime (21137377).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21137371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40077 + ... + 40600.

It is an arithmetic number, because the mean of its divisors is an integer number (3993561).

Almost surely, 2^21137374 is an apocalyptic number.

21137374 is a deficient number, since it is larger than the sum of its proper divisors (10811114).

21137374 is a wasteful number, since it uses less digits than its factorization.

21137374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80810.

The product of its digits is 3528, while the sum is 28.

The square root of 21137374 is about 4597.5399943883. The cubic root of 21137374 is about 276.4927049492.

The spelling of 21137374 in words is "twenty-one million, one hundred thirty-seven thousand, three hundred seventy-four".