2331220121 has 2 divisors, whose sum is σ = 2331220122. Its totient is φ = 2331220120.

The previous prime is 2331220061. The next prime is 2331220139. The reversal of 2331220121 is 1210221332.

2331220121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2085200896 + 246019225 = 45664^2 + 15685^2 .

It is a cyclic number.

It is not a de Polignac number, because 2331220121 - 2¹⁴ = 2331203737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2331220121.

It is not a weakly prime, because it can be changed into another prime (2331250121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1165610060 + 1165610061.

It is an arithmetic number, because the mean of its divisors is an integer number (1165610061).

Almost surely, 2^2331220121 is an apocalyptic number.

It is an amenable number.

2331220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2331220121 is an equidigital number, since it uses as much as digits as its factorization.

2331220121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2331220121 is about 48282.7103733831. The cubic root of 2331220121 is about 1325.9518725134.

Adding to 2331220121 its reverse (1210221332), we get a palindrome (3541441453).

The spelling of 2331220121 in words is "two billion, three hundred thirty-one million, two hundred twenty thousand, one hundred twenty-one".