321220204224421 has 4 divisors (see below), whose sum is σ = 323531140945600. Its totient is φ = 318909267503244.

The previous prime is 321220204224407. The next prime is 321220204224427. The reversal of 321220204224421 is 124422402022123.

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 321220204224421 - 2³⁵ = 321185844486053 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 (321220204224427) 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, 1155468360381 + ... + 1155468360658.

It is an arithmetic number, because the mean of its divisors is an integer number (80882785236400).

Almost surely, 2^{321220204224421} is an apocalyptic number.

It is an amenable number.

321220204224421 is a deficient number, since it is larger than the sum of its proper divisors (2310936721179).

321220204224421 is a wasteful number, since it uses less digits than its factorization.

321220204224421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310936721178.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 321220204224421 its reverse (124422402022123), we get a palindrome (445642606246544).

The spelling of 321220204224421 in words is "three hundred twenty-one trillion, two hundred twenty billion, two hundred four million, two hundred twenty-four thousand, four hundred twenty-one".