321897430901 has 4 divisors (see below), whose sum is σ = 321898587552. Its totient is φ = 321896274252.

The previous prime is 321897430849. The next prime is 321897430909. The reversal of 321897430901 is 109034798123.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 109034798123 = 75041 ⋅1453003.

It is a cyclic number.

It is not a de Polignac number, because 321897430901 - 2¹⁰ = 321897429877 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 (321897430909) 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, 121040 + ... + 811446.

It is an arithmetic number, because the mean of its divisors is an integer number (80474646888).

Almost surely, 2^321897430901 is an apocalyptic number.

It is an amenable number.

321897430901 is a deficient number, since it is larger than the sum of its proper divisors (1156651).

321897430901 is an equidigital number, since it uses as much as digits as its factorization.

321897430901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156650.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 321897430901 in words is "three hundred twenty-one billion, eight hundred ninety-seven million, four hundred thirty thousand, nine hundred one".