21264060 has 24 divisors (see below), whose sum is σ = 59539536. Its totient is φ = 5670400.

The previous prime is 21264053. The next prime is 21264071. The reversal of 21264060 is 6046212.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 177141 + ... + 177260.

It is an arithmetic number, because the mean of its divisors is an integer number (2480814).

Almost surely, 2^21264060 is an apocalyptic number.

21264060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21264060 is an abundant number, since it is smaller than the sum of its proper divisors (38275476).

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

21264060 is a wasteful number, since it uses less digits than its factorization.

21264060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354413 (or 354411 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21264060 is about 4611.2969975919. The cubic root of 21264060 is about 277.0439876796.

The spelling of 21264060 in words is "twenty-one million, two hundred sixty-four thousand, sixty".