21968486 has 16 divisors (see below), whose sum is σ = 34201440. Its totient is φ = 10570560.

The previous prime is 21968483. The next prime is 21968489. The reversal of 21968486 is 68486912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21968483) and next prime (21968489).

It is a super-2 number, since 2×21968486² = 965228754264392, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21968483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29855 + ... + 30581.

It is an arithmetic number, because the mean of its divisors is an integer number (2137590).

Almost surely, 2^21968486 is an apocalyptic number.

21968486 is a deficient number, since it is larger than the sum of its proper divisors (12232954).

21968486 is a wasteful number, since it uses less digits than its factorization.

21968486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279.

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

The square root of 21968486 is about 4687.0551522251. The cubic root of 21968486 is about 280.0700759979.

The spelling of 21968486 in words is "twenty-one million, nine hundred sixty-eight thousand, four hundred eighty-six".