21430312431 has 16 divisors (see below), whose sum is σ = 32176892928. Its totient is φ = 12569097600.

The previous prime is 21430312429. The next prime is 21430312433. The reversal of 21430312431 is 13421303412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21430312429) and next prime (21430312433).

It is not a de Polignac number, because 21430312431 - 2¹ = 21430312429 is a prime.

It is a super-2 number, since 2×21430312431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430312433) 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 in 15 ways as a sum of consecutive naturals, for example, 10473226 + ... + 10475271.

It is an arithmetic number, because the mean of its divisors is an integer number (2011055808).

Almost surely, 2^21430312431 is an apocalyptic number.

21430312431 is a deficient number, since it is larger than the sum of its proper divisors (10746580497).

21430312431 is a wasteful number, since it uses less digits than its factorization.

21430312431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20948542.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21430312431 its reverse (13421303412), we get a palindrome (34851615843).

The spelling of 21430312431 in words is "twenty-one billion, four hundred thirty million, three hundred twelve thousand, four hundred thirty-one".