431231032031221 has 4 divisors (see below), whose sum is σ = 431249964794572. Its totient is φ = 431212099267872.

The previous prime is 431231032031143. The next prime is 431231032031257. The reversal of 431231032031221 is 122130230132134.

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 410512740520996 + 20718291510225 = 20261114^2 + 4551735^2 .

It is a cyclic number.

It is not a de Polignac number, because 431231032031221 - 2¹¹ = 431231032029173 is a prime.

It is a super-2 number, since 2×431231032031221² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 431231032031221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431231032031291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9466347510 + ... + 9466393063.

It is an arithmetic number, because the mean of its divisors is an integer number (107812491198643).

Almost surely, 2^{431231032031221} is an apocalyptic number.

It is an amenable number.

431231032031221 is a deficient number, since it is larger than the sum of its proper divisors (18932763351).

431231032031221 is a wasteful number, since it uses less digits than its factorization.

431231032031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18932763350.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 431231032031221 its reverse (122130230132134), we get a palindrome (553361262163355).

The spelling of 431231032031221 in words is "four hundred thirty-one trillion, two hundred thirty-one billion, thirty-two million, thirty-one thousand, two hundred twenty-one".