2299999921 has 4 divisors (see below), whose sum is σ = 2435294052. Its totient is φ = 2164705792.

The previous prime is 2299999903. The next prime is 2299999987. The reversal of 2299999921 is 1299999922.

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 1564993600 + 735006321 = 39560^2 + 27111^2 .

It is a cyclic number.

It is not a de Polignac number, because 2299999921 - 2²⁷ = 2165782193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2299999921.

It is not an unprimeable number, because it can be changed into a prime (2299996921) 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, 67647040 + ... + 67647073.

It is an arithmetic number, because the mean of its divisors is an integer number (608823513).

Almost surely, 2^2299999921 is an apocalyptic number.

It is an amenable number.

2299999921 is a deficient number, since it is larger than the sum of its proper divisors (135294131).

2299999921 is a wasteful number, since it uses less digits than its factorization.

2299999921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135294130.

The product of its digits is 4251528, while the sum is 61.

The square root of 2299999921 is about 47958.3144094953. The cubic root of 2299999921 is about 1320.0061066828.

Subtracting from 2299999921 its reverse (1299999922), we obtain a palindrome (999999999).

The spelling of 2299999921 in words is "two billion, two hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred twenty-one".