21374064 has 40 divisors (see below), whose sum is σ = 61352720. Its totient is φ = 7124544.

The previous prime is 21374051. The next prime is 21374071. The reversal of 21374064 is 46047312.

It is a super-2 number, since 2×21374064² = 913701223752192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24307 + ... + 25170.

It is an arithmetic number, because the mean of its divisors is an integer number (1533818).

Almost surely, 2^21374064 is an apocalyptic number.

21374064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21374064 is an abundant number, since it is smaller than the sum of its proper divisors (39978656).

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

21374064 is a wasteful number, since it uses less digits than its factorization.

21374064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49494 (or 49482 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 21374064 is about 4623.2092749518. The cubic root of 21374064 is about 277.5209041959.

The spelling of 21374064 in words is "twenty-one million, three hundred seventy-four thousand, sixty-four".