2161953203 has 4 divisors (see below), whose sum is σ = 2163209688. Its totient is φ = 2160696720.

The previous prime is 2161953193. The next prime is 2161953239. The reversal of 2161953203 is 3023591612.

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

It is a cyclic number.

It is not a de Polignac number, because 2161953203 - 2⁴ = 2161953187 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 2161953203.

It is not an unprimeable number, because it can be changed into a prime (2161953503) 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, 625658 + ... + 629103.

It is an arithmetic number, because the mean of its divisors is an integer number (540802422).

Almost surely, 2^2161953203 is an apocalyptic number.

2161953203 is a deficient number, since it is larger than the sum of its proper divisors (1256485).

2161953203 is a wasteful number, since it uses less digits than its factorization.

2161953203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256484.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 2161953203 is about 46496.8085248870. The cubic root of 2161953203 is about 1293.0503307363.

The spelling of 2161953203 in words is "two billion, one hundred sixty-one million, nine hundred fifty-three thousand, two hundred three".