321521610601 has 4 divisors (see below), whose sum is σ = 321577620804. Its totient is φ = 321465600400.

The previous prime is 321521610593. The next prime is 321521610611. The reversal of 321521610601 is 106016125123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 106016125123 = 37 ⋅2865300679.

It can be written as a sum of positive squares in 2 ways, for example, as 237407690025 + 84113920576 = 487245^2 + 290024^2 .

It is a cyclic number.

It is not a de Polignac number, because 321521610601 - 2³ = 321521610593 is a prime.

It is a super-2 number, since 2×321521610601² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321521610601.

It is not an unprimeable number, because it can be changed into a prime (321521610611) 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, 27996490 + ... + 28007971.

It is an arithmetic number, because the mean of its divisors is an integer number (80394405201).

Almost surely, 2^321521610601 is an apocalyptic number.

It is an amenable number.

321521610601 is a deficient number, since it is larger than the sum of its proper divisors (56010203).

321521610601 is an equidigital number, since it uses as much as digits as its factorization.

321521610601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56010202.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 321521610601 its reverse (106016125123), we get a palindrome (427537735724).

The spelling of 321521610601 in words is "three hundred twenty-one billion, five hundred twenty-one million, six hundred ten thousand, six hundred one".