21054984 has 16 divisors (see below), whose sum is σ = 52637520. Its totient is φ = 7018320.

The previous prime is 21054973. The next prime is 21055003. The reversal of 21054984 is 48945012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438622 + ... + 438669.

It is an arithmetic number, because the mean of its divisors is an integer number (3289845).

Almost surely, 2^21054984 is an apocalyptic number.

21054984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21054984 is an abundant number, since it is smaller than the sum of its proper divisors (31582536).

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

21054984 is a wasteful number, since it uses less digits than its factorization.

21054984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877300 (or 877296 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 21054984 is about 4588.5710193915. The cubic root of 21054984 is about 276.1329961843.

Adding to 21054984 its reverse (48945012), we get a palindrome (69999996).

The spelling of 21054984 in words is "twenty-one million, fifty-four thousand, nine hundred eighty-four".