100320421321 has 4 divisors (see below), whose sum is σ = 100337901444. Its totient is φ = 100302941200.

The previous prime is 100320421291. The next prime is 100320421339. The reversal of 100320421321 is 123124023001.

It is a happy number.

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 57570723721 + 42749697600 = 239939^2 + 206760^2 .

It is a cyclic number.

It is not a de Polignac number, because 100320421321 - 2¹⁷ = 100320290249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100320421361) 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, 8731450 + ... + 8742931.

It is an arithmetic number, because the mean of its divisors is an integer number (25084475361).

Almost surely, 2^100320421321 is an apocalyptic number.

It is an amenable number.

100320421321 is a deficient number, since it is larger than the sum of its proper divisors (17480123).

100320421321 is an equidigital number, since it uses as much as digits as its factorization.

100320421321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17480122.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 100320421321 its reverse (123124023001), we get a palindrome (223444444322).

The spelling of 100320421321 in words is "one hundred billion, three hundred twenty million, four hundred twenty-one thousand, three hundred twenty-one".