2102156870 has 32 divisors (see below), whose sum is σ = 4167970560. Its totient is φ = 756995040.

The previous prime is 2102156863. The next prime is 2102156873. The reversal of 2102156870 is 786512012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102156873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81440 + ... + 104099.

It is an arithmetic number, because the mean of its divisors is an integer number (130249080).

Almost surely, 2^2102156870 is an apocalyptic number.

2102156870 is a deficient number, since it is larger than the sum of its proper divisors (2065813690).

2102156870 is a wasteful number, since it uses less digits than its factorization.

2102156870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185660.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 2102156870 is about 45849.2842910334. The cubic root of 2102156870 is about 1281.0174344651.

Adding to 2102156870 its reverse (786512012), we get a palindrome (2888668882).

The spelling of 2102156870 in words is "two billion, one hundred two million, one hundred fifty-six thousand, eight hundred seventy".