2123100321 has 4 divisors (see below), whose sum is σ = 2830800432. Its totient is φ = 1415400212.

The previous prime is 2123100311. The next prime is 2123100373. The reversal of 2123100321 is 1230013212.

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 2123100321 - 2⁹ = 2123099809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2123100321.

It is not an unprimeable number, because it can be changed into a prime (2123100311) 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, 353850051 + ... + 353850056.

It is an arithmetic number, because the mean of its divisors is an integer number (707700108).

Almost surely, 2^2123100321 is an apocalyptic number.

It is an amenable number.

2123100321 is a deficient number, since it is larger than the sum of its proper divisors (707700111).

2123100321 is an equidigital number, since it uses as much as digits as its factorization.

2123100321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707700110.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2123100321 is about 46077.1127676203. The cubic root of 2123100321 is about 1285.2575744724.

Adding to 2123100321 its reverse (1230013212), we get a palindrome (3353113533).

The spelling of 2123100321 in words is "two billion, one hundred twenty-three million, one hundred thousand, three hundred twenty-one".