21296631 has 8 divisors (see below), whose sum is σ = 30065904. Its totient is φ = 13362560.

The previous prime is 21296617. The next prime is 21296633. The reversal of 21296631 is 13669212.

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 21296631 - 2¹⁰ = 21295607 is a prime.

It is a super-2 number, since 2×21296631² = 907092983900322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21296633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208740 + ... + 208841.

It is an arithmetic number, because the mean of its divisors is an integer number (3758238).

Almost surely, 2^21296631 is an apocalyptic number.

21296631 is a deficient number, since it is larger than the sum of its proper divisors (8769273).

21296631 is a wasteful number, since it uses less digits than its factorization.

21296631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417601.

The product of its digits is 3888, while the sum is 30.

The square root of 21296631 is about 4614.8272990438. The cubic root of 21296631 is about 277.1853685882.

The spelling of 21296631 in words is "twenty-one million, two hundred ninety-six thousand, six hundred thirty-one".