31122430421 has 4 divisors (see below), whose sum is σ = 31123366092. Its totient is φ = 31121494752.

The previous prime is 31122430411. The next prime is 31122430447. The reversal of 31122430421 is 12403422113.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11403249796 + 19719180625 = 106786^2 + 140425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31122430421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122430411) 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, 416030 + ... + 485103.

It is an arithmetic number, because the mean of its divisors is an integer number (7780841523).

Almost surely, 2^31122430421 is an apocalyptic number.

It is an amenable number.

31122430421 is a deficient number, since it is larger than the sum of its proper divisors (935671).

31122430421 is an equidigital number, since it uses as much as digits as its factorization.

31122430421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935670.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31122430421 its reverse (12403422113), we get a palindrome (43525852534).

The spelling of 31122430421 in words is "thirty-one billion, one hundred twenty-two million, four hundred thirty thousand, four hundred twenty-one".