2100172 has 6 divisors (see below), whose sum is σ = 3675308. Its totient is φ = 1050084.

The previous prime is 2100167. The next prime is 2100173. The reversal of 2100172 is 2710012.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2100173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262518 + ... + 262525.

2^2100172 is an apocalyptic number.

It is an amenable number.

2100172 is a deficient number, since it is larger than the sum of its proper divisors (1575136).

2100172 is a wasteful number, since it uses less digits than its factorization.

2100172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525047 (or 525045 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 2100172 is about 1449.1970190419. The cubic root of 2100172 is about 128.0614125877.

Adding to 2100172 its reverse (2710012), we get a palindrome (4810184).

The spelling of 2100172 in words is "two million, one hundred thousand, one hundred seventy-two".