202312013221 has 4 divisors (see below), whose sum is σ = 202317306444. Its totient is φ = 202306720000.

The previous prime is 202312013173. The next prime is 202312013231. The reversal of 202312013221 is 122310213202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122310213202 = 2 ⋅61155106601.

It can be written as a sum of positive squares in 2 ways, for example, as 160076009025 + 42236004196 = 400095^2 + 205514^2 .

It is a cyclic number.

It is not a de Polignac number, because 202312013221 - 2⁷ = 202312013093 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 (202312013231) 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, 2588860 + ... + 2665861.

It is an arithmetic number, because the mean of its divisors is an integer number (50579326611).

Almost surely, 2^202312013221 is an apocalyptic number.

It is an amenable number.

202312013221 is a deficient number, since it is larger than the sum of its proper divisors (5293223).

202312013221 is an equidigital number, since it uses as much as digits as its factorization.

202312013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5293222.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 202312013221 its reverse (122310213202), we get a palindrome (324622226423).

The spelling of 202312013221 in words is "two hundred two billion, three hundred twelve million, thirteen thousand, two hundred twenty-one".