321425145221 has 4 divisors (see below), whose sum is σ = 321789160992. Its totient is φ = 321061129452.

The previous prime is 321425145149. The next prime is 321425145229. The reversal of 321425145221 is 122541524123.

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 321425145221 - 2¹⁸ = 321424883077 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 (321425145229) 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, 182006561 + ... + 182008326.

It is an arithmetic number, because the mean of its divisors is an integer number (80447290248).

Almost surely, 2^321425145221 is an apocalyptic number.

It is an amenable number.

321425145221 is a deficient number, since it is larger than the sum of its proper divisors (364015771).

321425145221 is an equidigital number, since it uses as much as digits as its factorization.

321425145221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364015770.

The product of its digits is 19200, while the sum is 32.

Adding to 321425145221 its reverse (122541524123), we get a palindrome (443966669344).

The spelling of 321425145221 in words is "three hundred twenty-one billion, four hundred twenty-five million, one hundred forty-five thousand, two hundred twenty-one".