2123855939 has 2 divisors, whose sum is σ = 2123855940. Its totient is φ = 2123855938.

The previous prime is 2123855927. The next prime is 2123855959. The reversal of 2123855939 is 9395583212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2123855939 - 2¹² = 2123851843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2123855893 and 2123855902.

It is not a weakly prime, because it can be changed into another prime (2123855959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061927969 + 1061927970.

It is an arithmetic number, because the mean of its divisors is an integer number (1061927970).

Almost surely, 2^2123855939 is an apocalyptic number.

2123855939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123855939 is an equidigital number, since it uses as much as digits as its factorization.

2123855939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 47.

The square root of 2123855939 is about 46085.3115319838. The cubic root of 2123855939 is about 1285.4100321083.

It can be divided in two parts, 21238 and 55939, that added together give a palindrome (77177).

The spelling of 2123855939 in words is "two billion, one hundred twenty-three million, eight hundred fifty-five thousand, nine hundred thirty-nine".