21264152 has 32 divisors (see below), whose sum is σ = 49072800. Its totient is φ = 8411904.

The previous prime is 21264151. The next prime is 21264157. The reversal of 21264152 is 25146212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21264151) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13877 + ... + 15332.

It is an arithmetic number, because the mean of its divisors is an integer number (1533525).

Almost surely, 2^21264152 is an apocalyptic number.

It is an amenable number.

21264152 is an abundant number, since it is smaller than the sum of its proper divisors (27808648).

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

21264152 is a wasteful number, since it uses less digits than its factorization.

21264152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29235 (or 29231 counting only the distinct ones).

The product of its digits is 960, while the sum is 23.

The square root of 21264152 is about 4611.3069730826. The cubic root of 21264152 is about 277.0443872271.

The spelling of 21264152 in words is "twenty-one million, two hundred sixty-four thousand, one hundred fifty-two".