21483980 has 24 divisors (see below), whose sum is σ = 51561888. Its totient is φ = 7365888.

The previous prime is 21483967. The next prime is 21483991. The reversal of 21483980 is 8938412.

It is a happy number.

It is a super-2 number, since 2×21483980² = 923122793280800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 21483980.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76589 + ... + 76868.

It is an arithmetic number, because the mean of its divisors is an integer number (2148412).

Almost surely, 2^21483980 is an apocalyptic number.

21483980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21483980 is an abundant number, since it is smaller than the sum of its proper divisors (30077908).

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

21483980 is a wasteful number, since it uses less digits than its factorization.

21483980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153473 (or 153471 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 21483980 is about 4635.0814448076. The cubic root of 21483980 is about 277.9958076072.

The spelling of 21483980 in words is "twenty-one million, four hundred eighty-three thousand, nine hundred eighty".