21276604 has 24 divisors (see below), whose sum is σ = 38808000. Its totient is φ = 10194240.

The previous prime is 21276583. The next prime is 21276611. The reversal of 21276604 is 40667212.

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, 16669 + ... + 17899.

It is an arithmetic number, because the mean of its divisors is an integer number (1617000).

Almost surely, 2^21276604 is an apocalyptic number.

It is an amenable number.

21276604 is a deficient number, since it is larger than the sum of its proper divisors (17531396).

21276604 is a wasteful number, since it uses less digits than its factorization.

21276604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413 (or 1411 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 21276604 is about 4612.6569349996. The cubic root of 21276604 is about 277.0984544910.

The spelling of 21276604 in words is "twenty-one million, two hundred seventy-six thousand, six hundred four".