21477902 has 12 divisors (see below), whose sum is σ = 34224360. Its totient is φ = 10106976.

The previous prime is 21477889. The next prime is 21477913. The reversal of 21477902 is 20977412.

It is a super-2 number, since 2×21477902² = 922600548643208, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 18002 + ... + 19157.

It is an arithmetic number, because the mean of its divisors is an integer number (2852030).

Almost surely, 2^21477902 is an apocalyptic number.

21477902 is a deficient number, since it is larger than the sum of its proper divisors (12746458).

21477902 is a wasteful number, since it uses less digits than its factorization.

21477902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37195 (or 37178 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 21477902 is about 4634.4257465192. The cubic root of 21477902 is about 277.9695893447.

The spelling of 21477902 in words is "twenty-one million, four hundred seventy-seven thousand, nine hundred two".