21970884 has 24 divisors (see below), whose sum is σ = 55209280. Its totient is φ = 6760224.

The previous prime is 21970867. The next prime is 21970891. The reversal of 21970884 is 48807912.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70264 + ... + 70575.

Almost surely, 2^21970884 is an apocalyptic number.

It is an amenable number.

21970884 is an abundant number, since it is smaller than the sum of its proper divisors (33238396).

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

21970884 is a wasteful number, since it uses less digits than its factorization.

21970884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140859 (or 140857 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 21970884 is about 4687.3109561880. The cubic root of 21970884 is about 280.0802661040.

The spelling of 21970884 in words is "twenty-one million, nine hundred seventy thousand, eight hundred eighty-four".