21264424 has 32 divisors (see below), whose sum is σ = 41587200. Its totient is φ = 10180800.

The previous prime is 21264421. The next prime is 21264427. The reversal of 21264424 is 42446212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21264421) and next prime (21264427).

It is not an unprimeable number, because it can be changed into a prime (21264421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34729 + ... + 35335.

It is an arithmetic number, because the mean of its divisors is an integer number (1299600).

Almost surely, 2^21264424 is an apocalyptic number.

It is an amenable number.

21264424 is a deficient number, since it is larger than the sum of its proper divisors (20322776).

21264424 is a wasteful number, since it uses less digits than its factorization.

21264424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793 (or 789 counting only the distinct ones).

The product of its digits is 3072, while the sum is 25.

The square root of 21264424 is about 4611.3364657114. The cubic root of 21264424 is about 277.0455684915.

The spelling of 21264424 in words is "twenty-one million, two hundred sixty-four thousand, four hundred twenty-four".