21431103231 has 16 divisors (see below), whose sum is σ = 29844622080. Its totient is φ = 13653636480.

The previous prime is 21431103203. The next prime is 21431103233. The reversal of 21431103231 is 13230113412.

It is not a de Polignac number, because 21431103231 - 2⁶ = 21431103167 is a prime.

It is a super-2 number, since 2×21431103231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21431103198 and 21431103207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431103233) 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, 67066 + ... + 217623.

It is an arithmetic number, because the mean of its divisors is an integer number (1865288880).

Almost surely, 2^21431103231 is an apocalyptic number.

21431103231 is a deficient number, since it is larger than the sum of its proper divisors (8413518849).

21431103231 is a wasteful number, since it uses less digits than its factorization.

21431103231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285806.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21431103231 its reverse (13230113412), we get a palindrome (34661216643).

The spelling of 21431103231 in words is "twenty-one billion, four hundred thirty-one million, one hundred three thousand, two hundred thirty-one".