2101018 has 4 divisors (see below), whose sum is σ = 3151530. Its totient is φ = 1050508.

The previous prime is 2101007. The next prime is 2101019. The reversal of 2101018 is 8101012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2082249 + 18769 = 1443^2 + 137^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2100989 and 2101007.

It is not an unprimeable number, because it can be changed into a prime (2101019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525253 + ... + 525256.

2^2101018 is an apocalyptic number.

2101018 is a deficient number, since it is larger than the sum of its proper divisors (1050512).

2101018 is a wasteful number, since it uses less digits than its factorization.

2101018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050511.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2101018 is about 1449.4888754316. The cubic root of 2101018 is about 128.0786056892.

The spelling of 2101018 in words is "two million, one hundred one thousand, eighteen".