2130121323221 has 4 divisors (see below), whose sum is σ = 2130126852672. Its totient is φ = 2130115793772.

The previous prime is 2130121323181. The next prime is 2130121323223. The reversal of 2130121323221 is 1223231210312.

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 a de Polignac number, because none of the positive numbers 2^k-2130121323221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2130121323223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2139791 + ... + 2973036.

It is an arithmetic number, because the mean of its divisors is an integer number (532531713168).

Almost surely, 2^{2130121323221} is an apocalyptic number.

It is an amenable number.

2130121323221 is a deficient number, since it is larger than the sum of its proper divisors (5529451).

2130121323221 is an equidigital number, since it uses as much as digits as its factorization.

2130121323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5529450.

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

Adding to 2130121323221 its reverse (1223231210312), we get a palindrome (3353352533533).

The spelling of 2130121323221 in words is "two trillion, one hundred thirty billion, one hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty-one".