21460631 has 4 divisors (see below), whose sum is σ = 21483792. Its totient is φ = 21437472.

The previous prime is 21460603. The next prime is 21460643. The reversal of 21460631 is 13606412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21460631 - 2⁶ = 21460567 is a prime.

It is a super-2 number, since 2×21460631² = 921117365836322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21460597 and 21460606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21460331) 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, 10130 + ... + 12063.

It is an arithmetic number, because the mean of its divisors is an integer number (5370948).

Almost surely, 2^21460631 is an apocalyptic number.

21460631 is a deficient number, since it is larger than the sum of its proper divisors (23161).

21460631 is an equidigital number, since it uses as much as digits as its factorization.

21460631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23160.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21460631 is about 4632.5620341232. The cubic root of 21460631 is about 277.8950615785.

The spelling of 21460631 in words is "twenty-one million, four hundred sixty thousand, six hundred thirty-one".