21554982 has 24 divisors (see below), whose sum is σ = 48210240. Its totient is φ = 6953040.

The previous prime is 21554969. The next prime is 21554983. The reversal of 21554982 is 28945512.

21554982 is a `hidden beast` number, since 21 + 554 + 9 + 82 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18757 + ... + 19872.

It is an arithmetic number, because the mean of its divisors is an integer number (2008760).

Almost surely, 2^21554982 is an apocalyptic number.

21554982 is an abundant number, since it is smaller than the sum of its proper divisors (26655258).

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

21554982 is a wasteful number, since it uses less digits than its factorization.

21554982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38668 (or 38665 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 21554982 is about 4642.7343236502. The cubic root of 21554982 is about 278.3017185537.

The spelling of 21554982 in words is "twenty-one million, five hundred fifty-four thousand, nine hundred eighty-two".