21432023031 has 4 divisors (see below), whose sum is σ = 28576030712. Its totient is φ = 14288015352.

The previous prime is 21432023023. The next prime is 21432023051. The reversal of 21432023031 is 13032023412.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21432023031 - 2³ = 21432023023 is a prime.

It is a super-2 number, since 2×21432023031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21432022989 and 21432023007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432023051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3572003836 + ... + 3572003841.

It is an arithmetic number, because the mean of its divisors is an integer number (7144007678).

Almost surely, 2^21432023031 is an apocalyptic number.

21432023031 is a deficient number, since it is larger than the sum of its proper divisors (7144007681).

21432023031 is an equidigital number, since it uses as much as digits as its factorization.

21432023031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144007680.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21432023031 its reverse (13032023412), we get a palindrome (34464046443).

The spelling of 21432023031 in words is "twenty-one billion, four hundred thirty-two million, twenty-three thousand, thirty-one".