21264675 has 24 divisors (see below), whose sum is σ = 35317680. Its totient is φ = 11289600.

The previous prime is 21264613. The next prime is 21264689. The reversal of 21264675 is 57646212.

It is not a de Polignac number, because 21264675 - 2¹¹ = 21262627 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 20571 + ... + 21579.

It is an arithmetic number, because the mean of its divisors is an integer number (1471570).

Almost surely, 2^21264675 is an apocalyptic number.

21264675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21264675 is a deficient number, since it is larger than the sum of its proper divisors (14053005).

21264675 is a wasteful number, since it uses less digits than its factorization.

21264675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303 (or 1298 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 21264675 is about 4611.3636811685. The cubic root of 21264675 is about 277.0466585463.

The spelling of 21264675 in words is "twenty-one million, two hundred sixty-four thousand, six hundred seventy-five".