21092982 has 16 divisors (see below), whose sum is σ = 42236400. Its totient is φ = 7022592.

The previous prime is 21092977. The next prime is 21093011. The reversal of 21092982 is 28929012.

It is a happy number.

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, 5394 + ... + 8442.

It is an arithmetic number, because the mean of its divisors is an integer number (2639775).

Almost surely, 2^21092982 is an apocalyptic number.

21092982 is an abundant number, since it is smaller than the sum of its proper divisors (21143418).

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

21092982 is a wasteful number, since it uses less digits than its factorization.

21092982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4207.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 21092982 is about 4592.7096577075. The cubic root of 21092982 is about 276.2990090700.

The spelling of 21092982 in words is "twenty-one million, ninety-two thousand, nine hundred eighty-two".