2123238861 has 12 divisors (see below), whose sum is σ = 3084630588. Its totient is φ = 1407309504.

The previous prime is 2123238823. The next prime is 2123238877. The reversal of 2123238861 is 1688323212.

2123238861 is a `hidden beast` number, since 212 + 3 + 2 + 388 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1241505225 + 881733636 = 35235^2 + 29694^2 .

It is not a de Polignac number, because 2123238861 - 2⁶ = 2123238797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123238881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 680280 + ... + 683393.

It is an arithmetic number, because the mean of its divisors is an integer number (257052549).

Almost surely, 2^2123238861 is an apocalyptic number.

It is an amenable number.

2123238861 is a deficient number, since it is larger than the sum of its proper divisors (961391727).

2123238861 is a wasteful number, since it uses less digits than its factorization.

2123238861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363852 (or 1363849 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 2123238861 is about 46078.6160925000. The cubic root of 2123238861 is about 1285.2855297712.

The spelling of 2123238861 in words is "two billion, one hundred twenty-three million, two hundred thirty-eight thousand, eight hundred sixty-one".