2181749970 has 16 divisors (see below), whose sum is σ = 5236200000. Its totient is φ = 581799984.

The previous prime is 2181749959. The next prime is 2181750001. The reversal of 2181749970 is 799471812.

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, 36362470 + ... + 36362529.

It is an arithmetic number, because the mean of its divisors is an integer number (327262500).

Almost surely, 2^2181749970 is an apocalyptic number.

2181749970 is an abundant number, since it is smaller than the sum of its proper divisors (3054450030).

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

2181749970 is a wasteful number, since it uses less digits than its factorization.

2181749970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72725009.

The product of its (nonzero) digits is 254016, while the sum is 48.

The square root of 2181749970 is about 46709.2064800934. The cubic root of 2181749970 is about 1296.9851180082.

It can be divided in two parts, 2181 and 749970, that added together give a triangular number (752151 = T₁₂₂₆).

The spelling of 2181749970 in words is "two billion, one hundred eighty-one million, seven hundred forty-nine thousand, nine hundred seventy".