2121091299 has 8 divisors (see below), whose sum is σ = 3142357520. Its totient is φ = 1414060848.

The previous prime is 2121091289. The next prime is 2121091327. The reversal of 2121091299 is 9921901212.

It is not a de Polignac number, because 2121091299 - 2⁹ = 2121090787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121091289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39279442 + ... + 39279495.

It is an arithmetic number, because the mean of its divisors is an integer number (392794690).

Almost surely, 2^2121091299 is an apocalyptic number.

2121091299 is a deficient number, since it is larger than the sum of its proper divisors (1021266221).

2121091299 is an equidigital number, since it uses as much as digits as its factorization.

2121091299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78558946 (or 78558940 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 2121091299 is about 46055.3069580477. The cubic root of 2121091299 is about 1284.8520471402.

The spelling of 2121091299 in words is "two billion, one hundred twenty-one million, ninety-one thousand, two hundred ninety-nine".