2751216821 has 2 divisors, whose sum is σ = 2751216822. Its totient is φ = 2751216820.

The previous prime is 2751216817. The next prime is 2751216823. The reversal of 2751216821 is 1286121572.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2247708100 + 503508721 = 47410^2 + 22439^2 .

It is a cyclic number.

It is not a de Polignac number, because 2751216821 - 2² = 2751216817 is a prime.

Together with 2751216823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2751216823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1375608410 + 1375608411.

It is an arithmetic number, because the mean of its divisors is an integer number (1375608411).

Almost surely, 2^2751216821 is an apocalyptic number.

It is an amenable number.

2751216821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2751216821 is an equidigital number, since it uses as much as digits as its factorization.

2751216821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 35.

The square root of 2751216821 is about 52452.0430583976. The cubic root of 2751216821 is about 1401.2262760873.

The spelling of 2751216821 in words is "two billion, seven hundred fifty-one million, two hundred sixteen thousand, eight hundred twenty-one".