321140613126561 has 16 divisors (see below), whose sum is σ = 430146439430400. Its totient is φ = 213115268538000.

The previous prime is 321140613126523. The next prime is 321140613126589. The reversal of 321140613126561 is 165621316041123.

It is not a de Polignac number, because 321140613126561 - 2¹⁵ = 321140613093793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321140613126961) 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, 124230235 + ... + 126788928.

It is an arithmetic number, because the mean of its divisors is an integer number (26884152464400).

Almost surely, 2^{321140613126561} is an apocalyptic number.

It is an amenable number.

321140613126561 is a deficient number, since it is larger than the sum of its proper divisors (109005826303839).

321140613126561 is a wasteful number, since it uses less digits than its factorization.

321140613126561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251021116.

The product of its (nonzero) digits is 155520, while the sum is 42.

Adding to 321140613126561 its reverse (165621316041123), we get a palindrome (486761929167684).

The spelling of 321140613126561 in words is "three hundred twenty-one trillion, one hundred forty billion, six hundred thirteen million, one hundred twenty-six thousand, five hundred sixty-one".