21982104 has 40 divisors (see below), whose sum is σ = 61572060. Its totient is φ = 7327152.

The previous prime is 21982099. The next prime is 21982117. The reversal of 21982104 is 40128912.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16314 + ... + 17609.

Almost surely, 2^21982104 is an apocalyptic number.

21982104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21982104 is an abundant number, since it is smaller than the sum of its proper divisors (39589956).

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

21982104 is a wasteful number, since it uses less digits than its factorization.

21982104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33941 (or 33928 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21982104 is about 4688.5076516947. The cubic root of 21982104 is about 280.1279347337.

The spelling of 21982104 in words is "twenty-one million, nine hundred eighty-two thousand, one hundred four".