2101621694 has 4 divisors (see below), whose sum is σ = 3152432544. Its totient is φ = 1050810846.

The previous prime is 2101621679. The next prime is 2101621733. The reversal of 2101621694 is 4961261012.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2101621694.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525405422 + ... + 525405425.

It is an arithmetic number, because the mean of its divisors is an integer number (788108136).

Almost surely, 2^2101621694 is an apocalyptic number.

2101621694 is a deficient number, since it is larger than the sum of its proper divisors (1050810850).

2101621694 is a wasteful number, since it uses less digits than its factorization.

2101621694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050810849.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 2101621694 is about 45843.4476670331. The cubic root of 2101621694 is about 1280.9087162905.

The spelling of 2101621694 in words is "two billion, one hundred one million, six hundred twenty-one thousand, six hundred ninety-four".