321122400221 has 16 divisors (see below), whose sum is σ = 386553014400. Its totient is φ = 260598809088.

The previous prime is 321122400187. The next prime is 321122400229. The reversal of 321122400221 is 122004221123.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321122400221 is a prime.

It is a super-2 number, since 2×321122400221² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 321122400193 and 321122400202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321122400229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 536300 + ... + 964293.

It is an arithmetic number, because the mean of its divisors is an integer number (24159563400).

Almost surely, 2^321122400221 is an apocalyptic number.

It is an amenable number.

321122400221 is a deficient number, since it is larger than the sum of its proper divisors (65430614179).

321122400221 is a wasteful number, since it uses less digits than its factorization.

321122400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502228.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 321122400221 its reverse (122004221123), we get a palindrome (443126621344).

The spelling of 321122400221 in words is "three hundred twenty-one billion, one hundred twenty-two million, four hundred thousand, two hundred twenty-one".