21374045 has 48 divisors (see below), whose sum is σ = 33196800. Its totient is φ = 13194720.

The previous prime is 21374029. The next prime is 21374051. The reversal of 21374045 is 54047312.

It is not a de Polignac number, because 21374045 - 2⁴ = 21374029 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 207464 + ... + 207566.

It is an arithmetic number, because the mean of its divisors is an integer number (691600).

Almost surely, 2^21374045 is an apocalyptic number.

It is an amenable number.

21374045 is a deficient number, since it is larger than the sum of its proper divisors (11822755).

21374045 is a wasteful number, since it uses less digits than its factorization.

21374045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 21374045 is about 4623.2072201016. The cubic root of 21374045 is about 277.5208219638.

The spelling of 21374045 in words is "twenty-one million, three hundred seventy-four thousand, forty-five".