6225126821 has 2 divisors, whose sum is σ = 6225126822. Its totient is φ = 6225126820.

The previous prime is 6225126797. The next prime is 6225126823. The reversal of 6225126821 is 1286215226.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5301878596 + 923248225 = 72814^2 + 30385^2 .

It is a cyclic number.

It is not a de Polignac number, because 6225126821 - 2¹⁸ = 6224864677 is a prime.

Together with 6225126823, 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 (6225126823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3112563410 + 3112563411.

It is an arithmetic number, because the mean of its divisors is an integer number (3112563411).

Almost surely, 2^6225126821 is an apocalyptic number.

It is an amenable number.

6225126821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6225126821 is an equidigital number, since it uses as much as digits as its factorization.

6225126821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 35.

The square root of 6225126821 is about 78899.4728816359. The cubic root of 6225126821 is about 1839.5689385817.

The spelling of 6225126821 in words is "six billion, two hundred twenty-five million, one hundred twenty-six thousand, eight hundred twenty-one".