2331202121021 has 4 divisors (see below), whose sum is σ = 2346050542332. Its totient is φ = 2316353699712.

The previous prime is 2331202120991. The next prime is 2331202121071. The reversal of 2331202121021 is 1201212021332.

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 298838248921 + 2032363872100 = 546661^2 + 1425610^2 .

It is a cyclic number.

It is not a de Polignac number, because 2331202121021 - 2¹⁸ = 2331201858877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2331202120984 and 2331202121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2331202121071) 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, 7424210420 + ... + 7424210733.

It is an arithmetic number, because the mean of its divisors is an integer number (586512635583).

Almost surely, 2^{2331202121021} is an apocalyptic number.

It is an amenable number.

2331202121021 is a deficient number, since it is larger than the sum of its proper divisors (14848421311).

2331202121021 is a wasteful number, since it uses less digits than its factorization.

2331202121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14848421310.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 2331202121021 its reverse (1201212021332), we get a palindrome (3532414142353).

The spelling of 2331202121021 in words is "two trillion, three hundred thirty-one billion, two hundred two million, one hundred twenty-one thousand, twenty-one".