21460431 has 8 divisors (see below), whose sum is σ = 28639360. Its totient is φ = 14294232.

The previous prime is 21460423. The next prime is 21460441. The reversal of 21460431 is 13406412.

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

It is not a de Polignac number, because 21460431 - 2³ = 21460423 is a prime.

It is a super-2 number, since 2×21460431² = 921100197411522, 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 = 21460398 and 21460407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21460441) 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, 1926 + ... + 6828.

It is an arithmetic number, because the mean of its divisors is an integer number (3579920).

Almost surely, 2^21460431 is an apocalyptic number.

21460431 is a deficient number, since it is larger than the sum of its proper divisors (7178929).

21460431 is a wasteful number, since it uses less digits than its factorization.

21460431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6365.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21460431 is about 4632.5404477457. The cubic root of 21460431 is about 277.8941983049.

Adding to 21460431 its reverse (13406412), we get a palindrome (34866843).

The spelling of 21460431 in words is "twenty-one million, four hundred sixty thousand, four hundred thirty-one".