2121222331213 has 4 divisors (see below), whose sum is σ = 2246000115420. Its totient is φ = 1996444547008.

The previous prime is 2121222331177. The next prime is 2121222331219. The reversal of 2121222331213 is 3121332221212.

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 836891973124 + 1284330358089 = 914818^2 + 1133283^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121222331213 - 2⁹ = 2121222330701 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 (2121222331219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62388892078 + ... + 62388892111.

It is an arithmetic number, because the mean of its divisors is an integer number (561500028855).

Almost surely, 2^{2121222331213} is an apocalyptic number.

It is an amenable number.

2121222331213 is a deficient number, since it is larger than the sum of its proper divisors (124777784207).

2121222331213 is a wasteful number, since it uses less digits than its factorization.

2121222331213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124777784206.

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

Adding to 2121222331213 its reverse (3121332221212), we get a palindrome (5242554552425).

The spelling of 2121222331213 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-two million, three hundred thirty-one thousand, two hundred thirteen".