2312120212221 has 16 divisors (see below), whose sum is σ = 3118851190080. Its totient is φ = 1523416752000.

The previous prime is 2312120212217. The next prime is 2312120212247. The reversal of 2312120212221 is 1222120212132.

It is not a de Polignac number, because 2312120212221 - 2² = 2312120212217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2312120212021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1322490 + ... + 2524523.

It is an arithmetic number, because the mean of its divisors is an integer number (194928199380).

Almost surely, 2^{2312120212221} is an apocalyptic number.

It is an amenable number.

2312120212221 is a deficient number, since it is larger than the sum of its proper divisors (806730977859).

2312120212221 is a wasteful number, since it uses less digits than its factorization.

2312120212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3849356.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 2312120212221 its reverse (1222120212132), we get a palindrome (3534240424353).

The spelling of 2312120212221 in words is "two trillion, three hundred twelve billion, one hundred twenty million, two hundred twelve thousand, two hundred twenty-one".