102001321 has 4 divisors (see below), whose sum is σ = 102223044. Its totient is φ = 101779600.

The previous prime is 102001313. The next prime is 102001349. The reversal of 102001321 is 123100201.

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 76387600 + 25613721 = 8740^2 + 5061^2 .

It is a cyclic number.

It is not a de Polignac number, because 102001321 - 2³ = 102001313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102001298 and 102001307.

It is not an unprimeable number, because it can be changed into a prime (102001391) 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, 110170 + ... + 111091.

It is an arithmetic number, because the mean of its divisors is an integer number (25555761).

Almost surely, 2^102001321 is an apocalyptic number.

It is an amenable number.

102001321 is a deficient number, since it is larger than the sum of its proper divisors (221723).

102001321 is an equidigital number, since it uses as much as digits as its factorization.

102001321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221722.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 102001321 is about 10099.5703373955. The cubic root of 102001321 is about 467.2348898681.

Adding to 102001321 its reverse (123100201), we get a palindrome (225101522).

The spelling of 102001321 in words is "one hundred two million, one thousand, three hundred twenty-one".