2090318921 has 4 divisors (see below), whose sum is σ = 2090522244. Its totient is φ = 2090115600.

The previous prime is 2090318917. The next prime is 2090318957. The reversal of 2090318921 is 1298130902.

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 1124663296 + 965655625 = 33536^2 + 31075^2 .

It is a cyclic number.

It is not a de Polignac number, because 2090318921 - 2² = 2090318917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2090318981) 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, 85370 + ... + 107091.

It is an arithmetic number, because the mean of its divisors is an integer number (522630561).

Almost surely, 2^2090318921 is an apocalyptic number.

It is an amenable number.

2090318921 is a deficient number, since it is larger than the sum of its proper divisors (203323).

2090318921 is a wasteful number, since it uses less digits than its factorization.

2090318921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203322.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 2090318921 is about 45720.0056977249. The cubic root of 2090318921 is about 1278.6082939061.

The spelling of 2090318921 in words is "two billion, ninety million, three hundred eighteen thousand, nine hundred twenty-one".