2123456771 has 2 divisors, whose sum is σ = 2123456772. Its totient is φ = 2123456770.

The previous prime is 2123456767. The next prime is 2123456801. The reversal of 2123456771 is 1776543212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2123456771 - 2² = 2123456767 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2123456371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061728385 + 1061728386.

It is an arithmetic number, because the mean of its divisors is an integer number (1061728386).

Almost surely, 2^2123456771 is an apocalyptic number.

2123456771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123456771 is an equidigital number, since it uses as much as digits as its factorization.

2123456771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 38.

The square root of 2123456771 is about 46080.9805776743. The cubic root of 2123456771 is about 1285.3294982877.

Adding to 2123456771 its reverse (1776543212), we get a palindrome (3899999983).

The spelling of 2123456771 in words is "two billion, one hundred twenty-three million, four hundred fifty-six thousand, seven hundred seventy-one".