431321220021 has 8 divisors (see below), whose sum is σ = 588469261600. Its totient is φ = 280860329232.

The previous prime is 431321220019. The next prime is 431321220049. The reversal of 431321220021 is 120022123134.

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

It is not a de Polignac number, because 431321220021 - 2¹ = 431321220019 is a prime.

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 431321220021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431321220521) 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, 1671787546 + ... + 1671787803.

It is an arithmetic number, because the mean of its divisors is an integer number (73558657700).

Almost surely, 2^431321220021 is an apocalyptic number.

It is an amenable number.

431321220021 is a deficient number, since it is larger than the sum of its proper divisors (157148041579).

431321220021 is a wasteful number, since it uses less digits than its factorization.

431321220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343575395.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 431321220021 its reverse (120022123134), we get a palindrome (551343343155).

The spelling of 431321220021 in words is "four hundred thirty-one billion, three hundred twenty-one million, two hundred twenty thousand, twenty-one".