2135215261 has 4 divisors (see below), whose sum is σ = 2187293724. Its totient is φ = 2083136800.

The previous prime is 2135215253. The next prime is 2135215273. The reversal of 2135215261 is 1625125312.

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 360278361 + 1774936900 = 18981^2 + 42130^2 .

It is a cyclic number.

It is not a de Polignac number, because 2135215261 - 2³ = 2135215253 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 (2135215211) 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, 26039170 + ... + 26039251.

It is an arithmetic number, because the mean of its divisors is an integer number (546823431).

Almost surely, 2^2135215261 is an apocalyptic number.

It is an amenable number.

2135215261 is a deficient number, since it is larger than the sum of its proper divisors (52078463).

2135215261 is an equidigital number, since it uses as much as digits as its factorization.

2135215261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52078462.

The product of its digits is 3600, while the sum is 28.

The square root of 2135215261 is about 46208.3895088327. The cubic root of 2135215261 is about 1287.6976059660.

The spelling of 2135215261 in words is "two billion, one hundred thirty-five million, two hundred fifteen thousand, two hundred sixty-one".