2103765221 has 4 divisors (see below), whose sum is σ = 2103912012. Its totient is φ = 2103618432.

The previous prime is 2103765211. The next prime is 2103765233. The reversal of 2103765221 is 1225673012.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1488030625 + 615734596 = 38575^2 + 24814^2 .

It is a cyclic number.

It is not a de Polignac number, because 2103765221 - 2²⁶ = 2036656357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2103765211) 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, 49250 + ... + 81443.

It is an arithmetic number, because the mean of its divisors is an integer number (525978003).

Almost surely, 2^2103765221 is an apocalyptic number.

It is an amenable number.

2103765221 is a deficient number, since it is larger than the sum of its proper divisors (146791).

2103765221 is a wasteful number, since it uses less digits than its factorization.

2103765221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146790.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 2103765221 is about 45866.8204806045. The cubic root of 2103765221 is about 1281.3440514548.

The spelling of 2103765221 in words is "two billion, one hundred three million, seven hundred sixty-five thousand, two hundred twenty-one".