21274473 has 16 divisors (see below), whose sum is σ = 31052736. Its totient is φ = 12848640.

The previous prime is 21274469. The next prime is 21274481. The reversal of 21274473 is 37447212.

It is not a de Polignac number, because 21274473 - 2² = 21274469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21274473.

It is not an unprimeable number, because it can be changed into a prime (21274453) 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 15 ways as a sum of consecutive naturals, for example, 10165 + ... + 12077.

It is an arithmetic number, because the mean of its divisors is an integer number (1940796).

Almost surely, 2^21274473 is an apocalyptic number.

It is an amenable number.

21274473 is a deficient number, since it is larger than the sum of its proper divisors (9778263).

21274473 is a wasteful number, since it uses less digits than its factorization.

21274473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264.

The product of its digits is 9408, while the sum is 30.

The square root of 21274473 is about 4612.4259343647. The cubic root of 21274473 is about 277.0892030691.

The spelling of 21274473 in words is "twenty-one million, two hundred seventy-four thousand, four hundred seventy-three".