21276944 has 20 divisors (see below), whose sum is σ = 44395596. Its totient is φ = 9820032.

The previous prime is 21276917. The next prime is 21276949. The reversal of 21276944 is 44967212.

It can be written as a sum of positive squares in 2 ways, for example, as 2890000 + 18386944 = 1700^2 + 4288^2 .

It is not an unprimeable number, because it can be changed into a prime (21276949) 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, 50939 + ... + 51354.

Almost surely, 2^21276944 is an apocalyptic number.

It is an amenable number.

21276944 is an abundant number, since it is smaller than the sum of its proper divisors (23118652).

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

21276944 is a wasteful number, since it uses less digits than its factorization.

21276944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102314 (or 102308 counting only the distinct ones).

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

The square root of 21276944 is about 4612.6937899670. The cubic root of 21276944 is about 277.0999304937.

The spelling of 21276944 in words is "twenty-one million, two hundred seventy-six thousand, nine hundred forty-four".