21902386 has 16 divisors (see below), whose sum is σ = 35912160. Its totient is φ = 9935680.

The previous prime is 21902347. The next prime is 21902407. The reversal of 21902386 is 68320912.

It is an unprimeable number.

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, 20985 + ... + 22003.

It is an arithmetic number, because the mean of its divisors is an integer number (2244510).

Almost surely, 2^21902386 is an apocalyptic number.

21902386 is a deficient number, since it is larger than the sum of its proper divisors (14009774).

21902386 is a wasteful number, since it uses less digits than its factorization.

21902386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2009.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 21902386 is about 4679.9985042733. The cubic root of 21902386 is about 279.7888970036.

The spelling of 21902386 in words is "twenty-one million, nine hundred two thousand, three hundred eighty-six".