2181881706 has 32 divisors (see below), whose sum is σ = 4557230208. Its totient is φ = 695101440.

The previous prime is 2181881699. The next prime is 2181881753. The reversal of 2181881706 is 6071881812.

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, 182010 + ... + 193626.

It is an arithmetic number, because the mean of its divisors is an integer number (142413444).

Almost surely, 2^2181881706 is an apocalyptic number.

2181881706 is an abundant number, since it is smaller than the sum of its proper divisors (2375348502).

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

2181881706 is a wasteful number, since it uses less digits than its factorization.

2181881706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13006.

The product of its (nonzero) digits is 43008, while the sum is 42.

The square root of 2181881706 is about 46710.6166304835. The cubic root of 2181881706 is about 1297.0112218537.

The spelling of 2181881706 in words is "two billion, one hundred eighty-one million, eight hundred eighty-one thousand, seven hundred six".