2162779921 has 2 divisors, whose sum is σ = 2162779922. Its totient is φ = 2162779920.

The previous prime is 2162779909. The next prime is 2162779939. The reversal of 2162779921 is 1299772612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1967898321 + 194881600 = 44361^2 + 13960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2162779921 is a prime.

It is not a weakly prime, because it can be changed into another prime (2162779991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081389960 + 1081389961.

It is an arithmetic number, because the mean of its divisors is an integer number (1081389961).

Almost surely, 2^2162779921 is an apocalyptic number.

It is an amenable number.

2162779921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2162779921 is an equidigital number, since it uses as much as digits as its factorization.

2162779921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 2162779921 is about 46505.6977261926. The cubic root of 2162779921 is about 1293.2151279750.

The spelling of 2162779921 in words is "two billion, one hundred sixty-two million, seven hundred seventy-nine thousand, nine hundred twenty-one".