2101851 has 12 divisors (see below), whose sum is σ = 3048760. Its totient is φ = 1395360.

The previous prime is 2101849. The next prime is 2101867. The reversal of 2101851 is 1581012.

It is not a de Polignac number, because 2101851 - 2¹ = 2101849 is a prime.

It is a Duffinian number.

2101851 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2101811) 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, 3396 + ... + 3966.

2^2101851 is an apocalyptic number.

2101851 is a deficient number, since it is larger than the sum of its proper divisors (946909).

2101851 is a wasteful number, since it uses less digits than its factorization.

2101851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986 (or 983 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 2101851 is about 1449.7761896238. The cubic root of 2101851 is about 128.0955300851.

Adding to 2101851 its reverse (1581012), we get a palindrome (3682863).

The spelling of 2101851 in words is "two million, one hundred one thousand, eight hundred fifty-one".