2124312661 has 4 divisors (see below), whose sum is σ = 2135096172. Its totient is φ = 2113529152.

The previous prime is 2124312601. The next prime is 2124312679. The reversal of 2124312661 is 1662134212.

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 1889640900 + 234671761 = 43470^2 + 15319^2 .

It is a cyclic number.

It is not a de Polignac number, because 2124312661 - 2⁹ = 2124312149 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 (2124312601) 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, 5391460 + ... + 5391853.

It is an arithmetic number, because the mean of its divisors is an integer number (533774043).

Almost surely, 2^2124312661 is an apocalyptic number.

It is an amenable number.

2124312661 is a deficient number, since it is larger than the sum of its proper divisors (10783511).

2124312661 is a wasteful number, since it uses less digits than its factorization.

2124312661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10783510.

The product of its digits is 3456, while the sum is 28.

The square root of 2124312661 is about 46090.2664453136. The cubic root of 2124312661 is about 1285.5021653132.

Adding to 2124312661 its reverse (1662134212), we get a palindrome (3786446873).

The spelling of 2124312661 in words is "two billion, one hundred twenty-four million, three hundred twelve thousand, six hundred sixty-one".