21276965 has 8 divisors (see below), whose sum is σ = 25557120. Its totient is φ = 17005072.

The previous prime is 21276953. The next prime is 21276973. The reversal of 21276965 is 56967212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21276965 - 2⁴ = 21276949 is a prime.

It is a super-2 number, since 2×21276965² = 905418479222450, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9152 + ... + 11238.

It is an arithmetic number, because the mean of its divisors is an integer number (3194640).

Almost surely, 2^21276965 is an apocalyptic number.

It is an amenable number.

21276965 is a deficient number, since it is larger than the sum of its proper divisors (4280155).

21276965 is a wasteful number, since it uses less digits than its factorization.

21276965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4131.

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

The square root of 21276965 is about 4612.6960662936. The cubic root of 21276965 is about 277.1000216580.

It can be divided in two parts, 212 and 76965, that added together give a palindrome (77177).

The spelling of 21276965 in words is "twenty-one million, two hundred seventy-six thousand, nine hundred sixty-five".