321640310220001 has 4 divisors (see below), whose sum is σ = 321640448606100. Its totient is φ = 321640171833904.

The previous prime is 321640310219957. The next prime is 321640310220007. The reversal of 321640310220001 is 100022013046123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 222648774816400 + 98991535403601 = 14921420^2 + 9949449^2 .

It is a cyclic number.

It is not a de Polignac number, because 321640310220001 - 2¹⁹ = 321640309695713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321640310220007) 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, 65646106 + ... + 70375363.

It is an arithmetic number, because the mean of its divisors is an integer number (80410112151525).

Almost surely, 2^{321640310220001} is an apocalyptic number.

It is an amenable number.

321640310220001 is a deficient number, since it is larger than the sum of its proper divisors (138386099).

321640310220001 is a wasteful number, since it uses less digits than its factorization.

321640310220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138386098.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 321640310220001 its reverse (100022013046123), we get a palindrome (421662323266124).

The spelling of 321640310220001 in words is "three hundred twenty-one trillion, six hundred forty billion, three hundred ten million, two hundred twenty thousand, one".