21980553 has 16 divisors (see below), whose sum is σ = 34400640. Its totient is φ = 12220416.

The previous prime is 21980513. The next prime is 21980561. The reversal of 21980553 is 35508912.

It is not a de Polignac number, because 21980553 - 2⁹ = 21980041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21980513) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13368 + ... + 14921.

It is an arithmetic number, because the mean of its divisors is an integer number (2150040).

Almost surely, 2^21980553 is an apocalyptic number.

It is an amenable number.

21980553 is a deficient number, since it is larger than the sum of its proper divisors (12420087).

21980553 is a wasteful number, since it uses less digits than its factorization.

21980553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28336.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 21980553 is about 4688.3422443333. The cubic root of 21980553 is about 280.1213462130.

The spelling of 21980553 in words is "twenty-one million, nine hundred eighty thousand, five hundred fifty-three".