21980484 has 60 divisors (see below), whose sum is σ = 57934800. Its totient is φ = 7266672.

The previous prime is 21980467. The next prime is 21980513. The reversal of 21980484 is 48408912.

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 57807 + ... + 58185.

It is an arithmetic number, because the mean of its divisors is an integer number (965580).

Almost surely, 2^21980484 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21980484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28967400).

21980484 is an abundant number, since it is smaller than the sum of its proper divisors (35954316).

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

21980484 is a wasteful number, since it uses less digits than its factorization.

21980484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 563 counting only the distinct ones).

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

The square root of 21980484 is about 4688.3348856497. The cubic root of 21980484 is about 280.1210530994.

The spelling of 21980484 in words is "twenty-one million, nine hundred eighty thousand, four hundred eighty-four".