21973480 has 32 divisors (see below), whose sum is σ = 49575240. Its totient is φ = 8765440.

The previous prime is 21973463. The next prime is 21973529. The reversal of 21973480 is 8437912.

It can be written as a sum of positive squares in 4 ways, for example, as 21958596 + 14884 = 4686^2 + 122^2 .

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, 25212 + ... + 26068.

Almost surely, 2^21973480 is an apocalyptic number.

21973480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21973480 is an abundant number, since it is smaller than the sum of its proper divisors (27601760).

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

21973480 is a wasteful number, since it uses less digits than its factorization.

21973480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509 (or 1505 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 21973480 is about 4687.5878658432. The cubic root of 21973480 is about 280.0912967592.

The spelling of 21973480 in words is "twenty-one million, nine hundred seventy-three thousand, four hundred eighty".