21374668 has 12 divisors (see below), whose sum is σ = 42749392. Its totient is φ = 9160560.

The previous prime is 21374657. The next prime is 21374687. The reversal of 21374668 is 86647312.

21374668 is an admirable number.

It is a super-2 number, since 2×21374668² = 913752864220448, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 381663 + ... + 381718.

Almost surely, 2^21374668 is an apocalyptic number.

21374668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21374668 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21374668 is a wasteful number, since it uses less digits than its factorization.

21374668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763392 (or 763390 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 21374668 is about 4623.2745970794. The cubic root of 21374668 is about 277.5235182838.

The spelling of 21374668 in words is "twenty-one million, three hundred seventy-four thousand, six hundred sixty-eight".