2101897 has 12 divisors (see below), whose sum is σ = 2554240. Its totient is φ = 1694016.

The previous prime is 2101873. The next prime is 2101903. The reversal of 2101897 is 7981012.

It is not a de Polignac number, because 2101897 - 2¹⁵ = 2069129 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a Duffinian number.

2101897 is a modest number, since divided by 1897 gives 21 as remainder.

It is not an unprimeable number, because it can be changed into a prime (2101807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1504 + ... + 2542.

2^2101897 is an apocalyptic number.

It is an amenable number.

2101897 is a deficient number, since it is larger than the sum of its proper divisors (452343).

2101897 is a wasteful number, since it uses less digits than its factorization.

2101897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080 (or 1063 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2101897 is about 1449.7920540546. The cubic root of 2101897 is about 128.0964645554.

It can be divided in two parts, 21018 and 97, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 2101897 in words is "two million, one hundred one thousand, eight hundred ninety-seven".