2312212331221 has 8 divisors (see below), whose sum is σ = 2490967677240. Its totient is φ = 2133584536512.

The previous prime is 2312212331167. The next prime is 2312212331239. The reversal of 2312212331221 is 1221332122132.

It can be written as a sum of positive squares in 4 ways, for example, as 19213840996 + 2292998490225 = 138614^2 + 1514265^2 .

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

It is not a de Polignac number, because 2312212331221 - 2³³ = 2303622396629 is a prime.

It is a super-2 number, since 2×2312212331221² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2312212331281) 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, 31850170 + ... + 31922683.

It is an arithmetic number, because the mean of its divisors is an integer number (311370959655).

Almost surely, 2^{2312212331221} is an apocalyptic number.

It is an amenable number.

2312212331221 is a deficient number, since it is larger than the sum of its proper divisors (178755346019).

2312212331221 is a wasteful number, since it uses less digits than its factorization.

2312212331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63775655.

The product of its digits is 1728, while the sum is 25.

Adding to 2312212331221 its reverse (1221332122132), we get a palindrome (3533544453353).

The spelling of 2312212331221 in words is "two trillion, three hundred twelve billion, two hundred twelve million, three hundred thirty-one thousand, two hundred twenty-one".