21319976 has 16 divisors (see below), whose sum is σ = 42079200. Its totient is φ = 10098864.

The previous prime is 21319937. The next prime is 21319979. The reversal of 21319976 is 67991312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (21319979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69980 + ... + 70283.

It is an arithmetic number, because the mean of its divisors is an integer number (2629950).

Almost surely, 2^21319976 is an apocalyptic number.

It is an amenable number.

21319976 is a deficient number, since it is larger than the sum of its proper divisors (20759224).

21319976 is a wasteful number, since it uses less digits than its factorization.

21319976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140288 (or 140284 counting only the distinct ones).

The product of its digits is 20412, while the sum is 38.

The square root of 21319976 is about 4617.3559533569. The cubic root of 21319976 is about 277.2866135448.

The spelling of 21319976 in words is "twenty-one million, three hundred nineteen thousand, nine hundred seventy-six".