2102304231221 has 4 divisors (see below), whose sum is σ = 2102341621344. Its totient is φ = 2102266841100.

The previous prime is 2102304231211. The next prime is 2102304231229. The reversal of 2102304231221 is 1221324032012.

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 2102304231221 - 2²⁶ = 2102237122357 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 (2102304231229) 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, 18610595 + ... + 18723216.

It is an arithmetic number, because the mean of its divisors is an integer number (525585405336).

Almost surely, 2^{2102304231221} is an apocalyptic number.

It is an amenable number.

2102304231221 is a deficient number, since it is larger than the sum of its proper divisors (37390123).

2102304231221 is an equidigital number, since it uses as much as digits as its factorization.

2102304231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37390122.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 2102304231221 its reverse (1221324032012), we get a palindrome (3323628263233).

The spelling of 2102304231221 in words is "two trillion, one hundred two billion, three hundred four million, two hundred thirty-one thousand, two hundred twenty-one".