21100982 has 32 divisors (see below), whose sum is σ = 39744000. Its totient is φ = 8192448.

The previous prime is 21100969. The next prime is 21100993. The reversal of 21100982 is 28900112.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4394 + ... + 7842.

It is an arithmetic number, because the mean of its divisors is an integer number (1242000).

Almost surely, 2^21100982 is an apocalyptic number.

21100982 is a deficient number, since it is larger than the sum of its proper divisors (18643018).

21100982 is a wasteful number, since it uses less digits than its factorization.

21100982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 21100982 is about 4593.5805206832. The cubic root of 21100982 is about 276.3339355791. Note that the first 3 decimals are identical.

The spelling of 21100982 in words is "twenty-one million, one hundred thousand, nine hundred eighty-two".