21276344 has 16 divisors (see below), whose sum is σ = 40570200. Its totient is φ = 10457632.

The previous prime is 21276337. The next prime is 21276347. The reversal of 21276344 is 44367212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21276347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22067 + ... + 23010.

Almost surely, 2^21276344 is an apocalyptic number.

It is an amenable number.

21276344 is a deficient number, since it is larger than the sum of its proper divisors (19293856).

21276344 is a wasteful number, since it uses less digits than its factorization.

21276344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45142 (or 45138 counting only the distinct ones).

The product of its digits is 8064, while the sum is 29.

The square root of 21276344 is about 4612.6287515906. The cubic root of 21276344 is about 277.0973257725.

The spelling of 21276344 in words is "twenty-one million, two hundred seventy-six thousand, three hundred forty-four".