2102138 has 4 divisors (see below), whose sum is σ = 3153210. Its totient is φ = 1051068.

The previous prime is 2102137. The next prime is 2102143. The reversal of 2102138 is 8312012.

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., 2007889 + 94249 = 1417^2 + 307^2 .

It is not an unprimeable number, because it can be changed into a prime (2102137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525533 + ... + 525536.

2^2102138 is an apocalyptic number.

2102138 is a deficient number, since it is larger than the sum of its proper divisors (1051072).

2102138 is a wasteful number, since it uses less digits than its factorization.

2102138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051071.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2102138 is about 1449.8751670403. The cubic root of 2102138 is about 128.1013601438.

The spelling of 2102138 in words is "two million, one hundred two thousand, one hundred thirty-eight".