431220042121 has 12 divisors (see below), whose sum is σ = 486796094596. Its totient is φ = 381423129120.

The previous prime is 431220042119. The next prime is 431220042137. The reversal of 431220042121 is 121240022134.

It can be written as a sum of positive squares in 2 ways, for example, as 392081354896 + 39138687225 = 626164^2 + 197835^2 .

It is not a de Polignac number, because 431220042121 - 2¹ = 431220042119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 431220042092 and 431220042101.

It is not an unprimeable number, because it can be changed into a prime (431220012121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48155010 + ... + 48163963.

Almost surely, 2^431220042121 is an apocalyptic number.

It is an amenable number.

431220042121 is a deficient number, since it is larger than the sum of its proper divisors (55576052475).

431220042121 is a wasteful number, since it uses less digits than its factorization.

431220042121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96319032 (or 96319021 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 431220042121 its reverse (121240022134), we get a palindrome (552460064255).

The spelling of 431220042121 in words is "four hundred thirty-one billion, two hundred twenty million, forty-two thousand, one hundred twenty-one".