21276368 has 20 divisors (see below), whose sum is σ = 41650980. Its totient is φ = 10527744.

The previous prime is 21276347. The next prime is 21276377. The reversal of 21276368 is 86367212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14348944 + 6927424 = 3788^2 + 2632^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5303 + ... + 8406.

It is an arithmetic number, because the mean of its divisors is an integer number (2082549).

Almost surely, 2^21276368 is an apocalyptic number.

It is an amenable number.

21276368 is a deficient number, since it is larger than the sum of its proper divisors (20374612).

21276368 is a wasteful number, since it uses less digits than its factorization.

21276368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13814 (or 13808 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 21276368 is about 4612.6313531432. The cubic root of 21276368 is about 277.0974299623.

The spelling of 21276368 in words is "twenty-one million, two hundred seventy-six thousand, three hundred sixty-eight".