21274470 has 48 divisors (see below), whose sum is σ = 63217440. Its totient is φ = 4862592.

The previous prime is 21274469. The next prime is 21274481. The reversal of 21274470 is 7447212.

It is a happy number.

21274470 is a `hidden beast` number, since 212 + 7 + 447 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 16255 + ... + 17514.

It is an arithmetic number, because the mean of its divisors is an integer number (1317030).

Almost surely, 2^21274470 is an apocalyptic number.

21274470 is an abundant number, since it is smaller than the sum of its proper divisors (41942970).

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

21274470 is a wasteful number, since it uses less digits than its factorization.

21274470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33789 (or 33786 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 21274470 is about 4612.4256091562. The cubic root of 21274470 is about 277.0891900446.

The spelling of 21274470 in words is "twenty-one million, two hundred seventy-four thousand, four hundred seventy".