21231401431 has 2 divisors, whose sum is σ = 21231401432. Its totient is φ = 21231401430.

The previous prime is 21231401413. The next prime is 21231401461. The reversal of 21231401431 is 13410413212.

Together with previous prime (21231401413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21231401431 - 2⁹ = 21231400919 is a prime.

It is a super-2 number, since 2×21231401431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21231401461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615700715 + 10615700716.

It is an arithmetic number, because the mean of its divisors is an integer number (10615700716).

Almost surely, 2^21231401431 is an apocalyptic number.

21231401431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21231401431 is an equidigital number, since it uses as much as digits as its factorization.

21231401431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21231401431 its reverse (13410413212), we get a palindrome (34641814643).

The spelling of 21231401431 in words is "twenty-one billion, two hundred thirty-one million, four hundred one thousand, four hundred thirty-one".