331201213112221 has 4 divisors (see below), whose sum is σ = 331205373540700. Its totient is φ = 331197052683744.

The previous prime is 331201213112191. The next prime is 331201213112261. The reversal of 331201213112221 is 122211312102133.

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 274769942306596 + 56431270805625 = 16576186^2 + 7512075^2 .

It is a cyclic number.

It is not a de Polignac number, because 331201213112221 - 2²⁷ = 331201078894493 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 (331201213112261) 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, 2080094826 + ... + 2080254043.

It is an arithmetic number, because the mean of its divisors is an integer number (82801343385175).

Almost surely, 2^{331201213112221} is an apocalyptic number.

It is an amenable number.

331201213112221 is a deficient number, since it is larger than the sum of its proper divisors (4160428479).

331201213112221 is an equidigital number, since it uses as much as digits as its factorization.

331201213112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4160428478.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 331201213112221 its reverse (122211312102133), we get a palindrome (453412525214354).

The spelling of 331201213112221 in words is "three hundred thirty-one trillion, two hundred one billion, two hundred thirteen million, one hundred twelve thousand, two hundred twenty-one".