2551422221 has 2 divisors, whose sum is σ = 2551422222. Its totient is φ = 2551422220.

The previous prime is 2551422199. The next prime is 2551422227. The reversal of 2551422221 is 1222241552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2363320996 + 188101225 = 48614^2 + 13715^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551422221 - 2³⁰ = 1477680397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2551422227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275711110 + 1275711111.

It is an arithmetic number, because the mean of its divisors is an integer number (1275711111).

Almost surely, 2^2551422221 is an apocalyptic number.

It is an amenable number.

2551422221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551422221 is an equidigital number, since it uses as much as digits as its factorization.

2551422221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3200, while the sum is 26.

The square root of 2551422221 is about 50511.6048151313. The cubic root of 2551422221 is about 1366.4511522615.

Adding to 2551422221 its reverse (1222241552), we get a palindrome (3773663773).

The spelling of 2551422221 in words is "two billion, five hundred fifty-one million, four hundred twenty-two thousand, two hundred twenty-one".