2121331312201 has 4 divisors (see below), whose sum is σ = 2121337705600. Its totient is φ = 2121324918804.

The previous prime is 2121331312171. The next prime is 2121331312207. The reversal of 2121331312201 is 1022131331212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121331312201 - 2⁵ = 2121331312169 is a prime.

It is a super-2 number, since 2×2121331312201² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121331312207) 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, 2670081 + ... + 3372238.

It is an arithmetic number, because the mean of its divisors is an integer number (530334426400).

Almost surely, 2^{2121331312201} is an apocalyptic number.

It is an amenable number.

2121331312201 is a deficient number, since it is larger than the sum of its proper divisors (6393399).

2121331312201 is an equidigital number, since it uses as much as digits as its factorization.

2121331312201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6393398.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 2121331312201 its reverse (1022131331212), we get a palindrome (3143462643413).

The spelling of 2121331312201 in words is "two trillion, one hundred twenty-one billion, three hundred thirty-one million, three hundred twelve thousand, two hundred one".