321320101 has 4 divisors (see below), whose sum is σ = 321630400. Its totient is φ = 321009804.

The previous prime is 321320081. The next prime is 321320113. The reversal of 321320101 is 101023123.

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.

It is a cyclic number.

It is not a de Polignac number, because 321320101 - 2²⁵ = 287765669 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 (321321101) 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, 153591 + ... + 155668.

It is an arithmetic number, because the mean of its divisors is an integer number (80407600).

Almost surely, 2^321320101 is an apocalyptic number.

It is an amenable number.

321320101 is a deficient number, since it is larger than the sum of its proper divisors (310299).

321320101 is a wasteful number, since it uses less digits than its factorization.

321320101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310298.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 321320101 is about 17925.4037890364. The cubic root of 321320101 is about 684.9296469917.

Adding to 321320101 its reverse (101023123), we get a palindrome (422343224).

The spelling of 321320101 in words is "three hundred twenty-one million, three hundred twenty thousand, one hundred one".