20100121321 has 4 divisors (see below), whose sum is σ = 22971567232. Its totient is φ = 17228675412.

The previous prime is 20100121303. The next prime is 20100121367. The reversal of 20100121321 is 12312100102.

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 20100121321 - 2⁵ = 20100121289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20100121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1435722945 + ... + 1435722958.

It is an arithmetic number, because the mean of its divisors is an integer number (5742891808).

Almost surely, 2^20100121321 is an apocalyptic number.

It is an amenable number.

20100121321 is a deficient number, since it is larger than the sum of its proper divisors (2871445911).

20100121321 is an equidigital number, since it uses as much as digits as its factorization.

20100121321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871445910.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20100121321 its reverse (12312100102), we get a palindrome (32412221423).

The spelling of 20100121321 in words is "twenty billion, one hundred million, one hundred twenty-one thousand, three hundred twenty-one".