2101900 has 18 divisors (see below), whose sum is σ = 4561340. Its totient is φ = 840720.

The previous prime is 2101873. The next prime is 2101903. The reversal of 2101900 is 91012.

It is a super-2 number, since 2×2101900² = 8835967220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2101903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10410 + ... + 10609.

2^2101900 is an apocalyptic number.

2101900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101900 is an abundant number, since it is smaller than the sum of its proper divisors (2459440).

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

2101900 is a wasteful number, since it uses less digits than its factorization.

2101900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21033 (or 21026 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 2101900 is about 1449.7930886854. The cubic root of 2101900 is about 128.0965254986.

Adding to 2101900 its reverse (91012), we get a palindrome (2192912).

The spelling of 2101900 in words is "two million, one hundred one thousand, nine hundred".