21082554 has 12 divisors (see below), whose sum is σ = 45678906. Its totient is φ = 7027512.

The previous prime is 21082543. The next prime is 21082577. The reversal of 21082554 is 45528012.

It is a happy number.

21082554 is a `hidden beast` number, since 2 + 108 + 2 + 554 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10989225 + 10093329 = 3315^2 + 3177^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 585609 + ... + 585644.

Almost surely, 2^21082554 is an apocalyptic number.

21082554 is an abundant number, since it is smaller than the sum of its proper divisors (24596352).

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

21082554 is a wasteful number, since it uses less digits than its factorization.

21082554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171261 (or 1171258 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 21082554 is about 4591.5742398441. The cubic root of 21082554 is about 276.2534691046.

The spelling of 21082554 in words is "twenty-one million, eighty-two thousand, five hundred fifty-four".