21276956 has 12 divisors (see below), whose sum is σ = 37937592. Its totient is φ = 10437648.

The previous prime is 21276953. The next prime is 21276973. The reversal of 21276956 is 65967212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21276953) 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, 49970 + ... + 50393.

It is an arithmetic number, because the mean of its divisors is an integer number (3161466).

Almost surely, 2^21276956 is an apocalyptic number.

It is an amenable number.

21276956 is a deficient number, since it is larger than the sum of its proper divisors (16660636).

21276956 is a wasteful number, since it uses less digits than its factorization.

21276956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100420 (or 100418 counting only the distinct ones).

The product of its digits is 45360, while the sum is 38.

The square root of 21276956 is about 4612.6950907252. The cubic root of 21276956 is about 277.0999825876.

The spelling of 21276956 in words is "twenty-one million, two hundred seventy-six thousand, nine hundred fifty-six".