21480984 has 64 divisors (see below), whose sum is σ = 68198400. Its totient is φ = 6136992.

The previous prime is 21480973. The next prime is 21480997. The reversal of 21480984 is 48908412.

It is a super-2 number, since 2×21480984² = 922865347216512, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5592 + ... + 8615.

It is an arithmetic number, because the mean of its divisors is an integer number (1065600).

Almost surely, 2^21480984 is an apocalyptic number.

21480984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21480984 is an abundant number, since it is smaller than the sum of its proper divisors (46717416).

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

21480984 is a wasteful number, since it uses less digits than its factorization.

21480984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14229 (or 14219 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 21480984 is about 4634.7582461224. The cubic root of 21480984 is about 277.9828845802.

The spelling of 21480984 in words is "twenty-one million, four hundred eighty thousand, nine hundred eighty-four".