2187721834 has 16 divisors (see below), whose sum is σ = 3308104800. Its totient is φ = 1085034384.

The previous prime is 2187721813. The next prime is 2187721849. The reversal of 2187721834 is 4381277812.

2187721834 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2187721834² = 9572253645920647112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394509 + ... + 400015.

It is an arithmetic number, because the mean of its divisors is an integer number (206756550).

Almost surely, 2^2187721834 is an apocalyptic number.

2187721834 is a deficient number, since it is larger than the sum of its proper divisors (1120382966).

2187721834 is a wasteful number, since it uses less digits than its factorization.

2187721834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7077.

The product of its digits is 150528, while the sum is 43.

The square root of 2187721834 is about 46773.0887797674. The cubic root of 2187721834 is about 1298.1674048076.

The spelling of 2187721834 in words is "two billion, one hundred eighty-seven million, seven hundred twenty-one thousand, eight hundred thirty-four".