2101872 has 20 divisors (see below), whose sum is σ = 5429960. Its totient is φ = 700608.

The previous prime is 2101871. The next prime is 2101873. The reversal of 2101872 is 2781012.

It is an interprime number because it is at equal distance from previous prime (2101871) and next prime (2101873).

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21847 + ... + 21942.

It is an arithmetic number, because the mean of its divisors is an integer number (271498).

2^2101872 is an apocalyptic number.

It is an amenable number.

2101872 is an abundant number, since it is smaller than the sum of its proper divisors (3328088).

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

2101872 is a wasteful number, since it uses less digits than its factorization.

2101872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43800 (or 43794 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 2101872 is about 1449.7834321029. The cubic root of 2101872 is about 128.0959566928.

Adding to 2101872 its reverse (2781012), we get a palindrome (4882884).

The spelling of 2101872 in words is "two million, one hundred one thousand, eight hundred seventy-two".