21890502 has 24 divisors (see below), whose sum is σ = 47698560. Its totient is φ = 7255440.

The previous prime is 21890497. The next prime is 21890513. The reversal of 21890502 is 20509812.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 102 + ... + 6617.

It is an arithmetic number, because the mean of its divisors is an integer number (1987440).

Almost surely, 2^21890502 is an apocalyptic number.

21890502 is an abundant number, since it is smaller than the sum of its proper divisors (25808058).

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

21890502 is a wasteful number, since it uses less digits than its factorization.

21890502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6908 (or 6905 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 21890502 is about 4678.7286734753. The cubic root of 21890502 is about 279.7382843625.

The spelling of 21890502 in words is "twenty-one million, eight hundred ninety thousand, five hundred two".