331221112021 has 4 divisors (see below), whose sum is σ = 332642662092. Its totient is φ = 329799561952.

The previous prime is 331221111971. The next prime is 331221112049. The reversal of 331221112021 is 120211122133.

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 187238809521 + 143982302500 = 432711^2 + 379450^2 .

It is a cyclic number.

It is not a de Polignac number, because 331221112021 - 2²⁷ = 331086894293 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 331221112021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331221112121) 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, 710774686 + ... + 710775151.

It is an arithmetic number, because the mean of its divisors is an integer number (83160665523).

Almost surely, 2^331221112021 is an apocalyptic number.

It is an amenable number.

331221112021 is a deficient number, since it is larger than the sum of its proper divisors (1421550071).

331221112021 is a wasteful number, since it uses less digits than its factorization.

331221112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421550070.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 331221112021 its reverse (120211122133), we get a palindrome (451432234154).

The spelling of 331221112021 in words is "three hundred thirty-one billion, two hundred twenty-one million, one hundred twelve thousand, twenty-one".