2130123221321 has 4 divisors (see below), whose sum is σ = 2136842853252. Its totient is φ = 2123403589392.

The previous prime is 2130123221309. The next prime is 2130123221327. The reversal of 2130123221321 is 1231223210312.

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 380733425296 + 1749389796025 = 617036^2 + 1322645^2 .

It is a cyclic number.

It is not a de Polignac number, because 2130123221321 - 2¹⁸ = 2130122959177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2130123221327) 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, 3359815490 + ... + 3359816123.

It is an arithmetic number, because the mean of its divisors is an integer number (534210713313).

Almost surely, 2^{2130123221321} is an apocalyptic number.

It is an amenable number.

2130123221321 is a deficient number, since it is larger than the sum of its proper divisors (6719631931).

2130123221321 is an equidigital number, since it uses as much as digits as its factorization.

2130123221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6719631930.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 2130123221321 its reverse (1231223210312), we get a palindrome (3361346431633).

The spelling of 2130123221321 in words is "two trillion, one hundred thirty billion, one hundred twenty-three million, two hundred twenty-one thousand, three hundred twenty-one".