21430321031 has 8 divisors (see below), whose sum is σ = 24533523840. Its totient is φ = 18337550328.

The previous prime is 21430321021. The next prime is 21430321039. The reversal of 21430321031 is 13012303412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21430321031 - 2¹⁸ = 21430058887 is a prime.

It is a super-2 number, since 2×21430321031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21430320994 and 21430321012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430321039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2603621 + ... + 2611838.

It is an arithmetic number, because the mean of its divisors is an integer number (3066690480).

Almost surely, 2^21430321031 is an apocalyptic number.

21430321031 is a deficient number, since it is larger than the sum of its proper divisors (3103202809).

21430321031 is an equidigital number, since it uses as much as digits as its factorization.

21430321031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5216053.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21430321031 its reverse (13012303412), we get a palindrome (34442624443).

The spelling of 21430321031 in words is "twenty-one billion, four hundred thirty million, three hundred twenty-one thousand, thirty-one".