21410431 has 16 divisors (see below), whose sum is σ = 25369344. Its totient is φ = 17688384.

The previous prime is 21410423. The next prime is 21410437. The reversal of 21410431 is 13401412.

It is not a de Polignac number, because 21410431 - 2³ = 21410423 is a prime.

It is a super-2 number, since 2×21410431² = 916813111211522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21410437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24555 + ... + 25411.

It is an arithmetic number, because the mean of its divisors is an integer number (1585584).

Almost surely, 2^21410431 is an apocalyptic number.

21410431 is a deficient number, since it is larger than the sum of its proper divisors (3958913).

21410431 is an equidigital number, since it uses as much as digits as its factorization.

21410431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21410431 is about 4627.1406937762. The cubic root of 21410431 is about 277.6782114210.

Adding to 21410431 its reverse (13401412), we get a palindrome (34811843).

The spelling of 21410431 in words is "twenty-one million, four hundred ten thousand, four hundred thirty-one".