21966488 has 32 divisors (see below), whose sum is σ = 42532560. Its totient is φ = 10629120.

The previous prime is 21966487. The next prime is 21966491. The reversal of 21966488 is 88466912.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21966481) 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 7 ways as a sum of consecutive naturals, for example, 63131 + ... + 63477.

Almost surely, 2^21966488 is an apocalyptic number.

It is an amenable number.

21966488 is a deficient number, since it is larger than the sum of its proper divisors (20566072).

21966488 is a wasteful number, since it uses less digits than its factorization.

21966488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587 (or 583 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 21966488 is about 4686.8420071515. The cubic root of 21966488 is about 280.0615850930.

The spelling of 21966488 in words is "twenty-one million, nine hundred sixty-six thousand, four hundred eighty-eight".