21980959 has 24 divisors (see below), whose sum is σ = 30049488. Its totient is φ = 15805440.

The previous prime is 21980947. The next prime is 21980969. The reversal of 21980959 is 95908912.

It is not a de Polignac number, because 21980959 - 2⁹ = 21980447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21980909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5439 + ... + 8575.

It is an arithmetic number, because the mean of its divisors is an integer number (1252062).

Almost surely, 2^21980959 is an apocalyptic number.

21980959 is a deficient number, since it is larger than the sum of its proper divisors (8068529).

21980959 is a wasteful number, since it uses less digits than its factorization.

21980959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3175 (or 3168 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 21980959 is about 4688.3855430201. The cubic root of 21980959 is about 280.1230708976.

The spelling of 21980959 in words is "twenty-one million, nine hundred eighty thousand, nine hundred fifty-nine".