1212222251 has 2 divisors, whose sum is σ = 1212222252. Its totient is φ = 1212222250.

The previous prime is 1212222227. The next prime is 1212222259. The reversal of 1212222251 is 1522222121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212222251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212222259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606111125 + 606111126.

It is an arithmetic number, because the mean of its divisors is an integer number (606111126).

Almost surely, 2^1212222251 is an apocalyptic number.

1212222251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212222251 is an equidigital number, since it uses as much as digits as its factorization.

1212222251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 20.

The square root of 1212222251 is about 34816.9822213241. The cubic root of 1212222251 is about 1066.2541892253.

Adding to 1212222251 its reverse (1522222121), we get a palindrome (2734444372).

The spelling of 1212222251 in words is "one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred fifty-one".