2166221910 has 32 divisors (see below), whose sum is σ = 5220702720. Its totient is φ = 575240288.

The previous prime is 2166221909. The next prime is 2166221927. The reversal of 2166221910 is 191226612.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143892 + ... + 158231.

It is an arithmetic number, because the mean of its divisors is an integer number (163146960).

Almost surely, 2^2166221910 is an apocalyptic number.

2166221910 is an abundant number, since it is smaller than the sum of its proper divisors (3054480810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166221910 is a wasteful number, since it uses less digits than its factorization.

2166221910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302372.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 2166221910 is about 46542.6891144033. The cubic root of 2166221910 is about 1293.9007999907.

The spelling of 2166221910 in words is "two billion, one hundred sixty-six million, two hundred twenty-one thousand, nine hundred ten".