2161222108 has 24 divisors (see below), whose sum is σ = 4037281920. Its totient is φ = 1009315440.

The previous prime is 2161222093. The next prime is 2161222123. The reversal of 2161222108 is 8012221612.

It is an interprime number because it is at equal distance from previous prime (2161222093) and next prime (2161222123).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 194866 + ... + 205657.

It is an arithmetic number, because the mean of its divisors is an integer number (168220080).

Almost surely, 2^2161222108 is an apocalyptic number.

It is an amenable number.

2161222108 is a deficient number, since it is larger than the sum of its proper divisors (1876059812).

2161222108 is a wasteful number, since it uses less digits than its factorization.

2161222108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400617 (or 400615 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 2161222108 is about 46488.9460839886. The cubic root of 2161222108 is about 1292.9045598950.

The spelling of 2161222108 in words is "two billion, one hundred sixty-one million, two hundred twenty-two thousand, one hundred eight".