2121090473 has 4 divisors (see below), whose sum is σ = 2121184260. Its totient is φ = 2120996688.

The previous prime is 2121090467. The next prime is 2121090487. The reversal of 2121090473 is 3740901212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1711311424 + 409779049 = 41368^2 + 20243^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121090473 - 2⁴ = 2121090457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121090443) 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, 10211 + ... + 65927.

It is an arithmetic number, because the mean of its divisors is an integer number (530296065).

Almost surely, 2^2121090473 is an apocalyptic number.

It is an amenable number.

2121090473 is a deficient number, since it is larger than the sum of its proper divisors (93787).

2121090473 is an equidigital number, since it uses as much as digits as its factorization.

2121090473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93786.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 2121090473 is about 46055.2979905678. The cubic root of 2121090473 is about 1284.8518803569.

Adding to 2121090473 its reverse (3740901212), we get a palindrome (5861991685).

The spelling of 2121090473 in words is "two billion, one hundred twenty-one million, ninety thousand, four hundred seventy-three".