21613802 has 24 divisors (see below), whose sum is σ = 37882656. Its totient is φ = 9248652.

The previous prime is 21613799. The next prime is 21613819. The reversal of 21613802 is 20831612.

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 11 ways as a sum of consecutive naturals, for example, 33293 + ... + 33935.

It is an arithmetic number, because the mean of its divisors is an integer number (1578444).

Almost surely, 2^21613802 is an apocalyptic number.

21613802 is a deficient number, since it is larger than the sum of its proper divisors (16268854).

21613802 is an frugal number, since it uses more digits than its factorization.

21613802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21613802 is about 4649.0646371071. The cubic root of 21613802 is about 278.5546351731.

The spelling of 21613802 in words is "twenty-one million, six hundred thirteen thousand, eight hundred two".