2100120331321 has 4 divisors (see below), whose sum is σ = 2101510220544. Its totient is φ = 2098730442100.

The previous prime is 2100120331297. The next prime is 2100120331357. The reversal of 2100120331321 is 1231330210012.

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 2100120331321 - 2¹³ = 2100120323129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100120331121) 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, 694942345 + ... + 694945366.

It is an arithmetic number, because the mean of its divisors is an integer number (525377555136).

Almost surely, 2^{2100120331321} is an apocalyptic number.

It is an amenable number.

2100120331321 is a deficient number, since it is larger than the sum of its proper divisors (1389889223).

2100120331321 is a wasteful number, since it uses less digits than its factorization.

2100120331321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389889222.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 2100120331321 its reverse (1231330210012), we get a palindrome (3331450541333).

The spelling of 2100120331321 in words is "two trillion, one hundred billion, one hundred twenty million, three hundred thirty-one thousand, three hundred twenty-one".