2212551221 has 2 divisors, whose sum is σ = 2212551222. Its totient is φ = 2212551220.

The previous prime is 2212551181. The next prime is 2212551227. The reversal of 2212551221 is 1221552122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2210316196 + 2235025 = 47014^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212551221 - 2⁶ = 2212551157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2212551227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1106275610 + 1106275611.

It is an arithmetic number, because the mean of its divisors is an integer number (1106275611).

Almost surely, 2^2212551221 is an apocalyptic number.

It is an amenable number.

2212551221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2212551221 is an equidigital number, since it uses as much as digits as its factorization.

2212551221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 800, while the sum is 23.

The square root of 2212551221 is about 47037.7637755028. The cubic root of 2212551221 is about 1303.0600931129.

Subtracting from 2212551221 its reverse (1221552122), we obtain a palindrome (990999099).

The spelling of 2212551221 in words is "two billion, two hundred twelve million, five hundred fifty-one thousand, two hundred twenty-one".