2181681700 has 36 divisors (see below), whose sum is σ = 5164638192. Its totient is φ = 793338400.

The previous prime is 2181681641. The next prime is 2181681731. The reversal of 2181681700 is 71861812.

It is a super-2 number, since 2×2181681700² = 9519470080229780000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 990574 + ... + 992773.

It is an arithmetic number, because the mean of its divisors is an integer number (143462172).

Almost surely, 2^2181681700 is an apocalyptic number.

2181681700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181681700 is an abundant number, since it is smaller than the sum of its proper divisors (2982956492).

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

2181681700 is a wasteful number, since it uses less digits than its factorization.

2181681700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983372 (or 1983365 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 34.

The square root of 2181681700 is about 46708.4756762624. The cubic root of 2181681700 is about 1296.9715897092.

The spelling of 2181681700 in words is "two billion, one hundred eighty-one million, six hundred eighty-one thousand, seven hundred".