321220245253 has 4 divisors (see below), whose sum is σ = 321284661760. Its totient is φ = 321155828748.

The previous prime is 321220245239. The next prime is 321220245263. The reversal of 321220245253 is 352542022123.

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 321220245253 - 2⁵ = 321220245221 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 (321220245263) 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, 32200773 + ... + 32210746.

It is an arithmetic number, because the mean of its divisors is an integer number (80321165440).

Almost surely, 2^321220245253 is an apocalyptic number.

It is an amenable number.

321220245253 is a deficient number, since it is larger than the sum of its proper divisors (64416507).

321220245253 is an equidigital number, since it uses as much as digits as its factorization.

321220245253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64416506.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 321220245253 its reverse (352542022123), we get a palindrome (673762267376).

The spelling of 321220245253 in words is "three hundred twenty-one billion, two hundred twenty million, two hundred forty-five thousand, two hundred fifty-three".