2101172870 has 32 divisors (see below), whose sum is σ = 3957638400. Its totient is φ = 802206720.

The previous prime is 2101172861. The next prime is 2101172881. The reversal of 2101172870 is 782711012.

It is a congruent number.

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, 23795 + ... + 69054.

It is an arithmetic number, because the mean of its divisors is an integer number (123676200).

Almost surely, 2^2101172870 is an apocalyptic number.

2101172870 is a deficient number, since it is larger than the sum of its proper divisors (1856465530).

2101172870 is a wasteful number, since it uses less digits than its factorization.

2101172870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92960.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 2101172870 is about 45838.5522240832. The cubic root of 2101172870 is about 1280.8175258373.

Adding to 2101172870 its reverse (782711012), we get a palindrome (2883883882).

The spelling of 2101172870 in words is "two billion, one hundred one million, one hundred seventy-two thousand, eight hundred seventy".