2161822252 has 12 divisors (see below), whose sum is σ = 3875462136. Its totient is φ = 1054547360.

The previous prime is 2161822241. The next prime is 2161822253. The reversal of 2161822252 is 2522281612.

It is not an unprimeable number, because it can be changed into a prime (2161822253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6590758 + ... + 6591085.

It is an arithmetic number, because the mean of its divisors is an integer number (322955178).

Almost surely, 2^2161822252 is an apocalyptic number.

It is an amenable number.

2161822252 is a deficient number, since it is larger than the sum of its proper divisors (1713639884).

2161822252 is a wasteful number, since it uses less digits than its factorization.

2161822252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13181888 (or 13181886 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 2161822252 is about 46495.4003316457. The cubic root of 2161822252 is about 1293.0242232251.

The spelling of 2161822252 in words is "two billion, one hundred sixty-one million, eight hundred twenty-two thousand, two hundred fifty-two".