21965960 has 16 divisors (see below), whose sum is σ = 49423500. Its totient is φ = 8786368.

The previous prime is 21965959. The next prime is 21965969. The reversal of 21965960 is 6956912.

It can be written as a sum of positive squares in 2 ways, for example, as 20921476 + 1044484 = 4574^2 + 1022^2 .

It is not an unprimeable number, because it can be changed into a prime (21965969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274535 + ... + 274614.

Almost surely, 2^21965960 is an apocalyptic number.

21965960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21965960 is an abundant number, since it is smaller than the sum of its proper divisors (27457540).

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

21965960 is a wasteful number, since it uses less digits than its factorization.

21965960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549160 (or 549156 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 21965960 is about 4686.7856789062. The cubic root of 21965960 is about 280.0593411643.

The spelling of 21965960 in words is "twenty-one million, nine hundred sixty-five thousand, nine hundred sixty".