2100991323 has 4 divisors (see below), whose sum is σ = 2801321768. Its totient is φ = 1400660880.

The previous prime is 2100991307. The next prime is 2100991369. The reversal of 2100991323 is 3231990012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2100991323 - 2⁴ = 2100991307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100991423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350165218 + ... + 350165223.

It is an arithmetic number, because the mean of its divisors is an integer number (700330442).

Almost surely, 2^2100991323 is an apocalyptic number.

2100991323 is a deficient number, since it is larger than the sum of its proper divisors (700330445).

2100991323 is an equidigital number, since it uses as much as digits as its factorization.

2100991323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700330444.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 2100991323 is about 45836.5718940673. The cubic root of 2100991323 is about 1280.7806360792.

The spelling of 2100991323 in words is "two billion, one hundred million, nine hundred ninety-one thousand, three hundred twenty-three".