2123950409 has 4 divisors (see below), whose sum is σ = 2427371904. Its totient is φ = 1820528916.

The previous prime is 2123950393. The next prime is 2123950421. The reversal of 2123950409 is 9040593212.

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 2123950409 - 2⁴ = 2123950393 is a prime.

It is a super-2 number, since 2×2123950409² = 9022330679782534562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123950469) 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, 151710737 + ... + 151710750.

It is an arithmetic number, because the mean of its divisors is an integer number (606842976).

Almost surely, 2^2123950409 is an apocalyptic number.

It is an amenable number.

2123950409 is a deficient number, since it is larger than the sum of its proper divisors (303421495).

2123950409 is an equidigital number, since it uses as much as digits as its factorization.

2123950409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303421494.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 2123950409 is about 46086.3364675475. The cubic root of 2123950409 is about 1285.4290903509.

The spelling of 2123950409 in words is "two billion, one hundred twenty-three million, nine hundred fifty thousand, four hundred nine".