2120210305 has 4 divisors (see below), whose sum is σ = 2544252372. Its totient is φ = 1696168240.

The previous prime is 2120210291. The next prime is 2120210359. The reversal of 2120210305 is 5030120212.

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 955489921 + 1164720384 = 30911^2 + 34128^2 .

It is not a de Polignac number, because 2120210305 - 2¹⁵ = 2120177537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212021026 + ... + 212021035.

It is an arithmetic number, because the mean of its divisors is an integer number (636063093).

Almost surely, 2^2120210305 is an apocalyptic number.

It is an amenable number.

2120210305 is a deficient number, since it is larger than the sum of its proper divisors (424042067).

2120210305 is an equidigital number, since it uses as much as digits as its factorization.

2120210305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424042066.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2120210305 is about 46045.7414426133. The cubic root of 2120210305 is about 1284.6741349967.

Adding to 2120210305 its reverse (5030120212), we get a palindrome (7150330517).

The spelling of 2120210305 in words is "two billion, one hundred twenty million, two hundred ten thousand, three hundred five".