221225051 has 2 divisors, whose sum is σ = 221225052. Its totient is φ = 221225050.

The previous prime is 221225027. The next prime is 221225077. The reversal of 221225051 is 150522122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221225051 - 2¹⁰ = 221224027 is a prime.

It is not a weakly prime, because it can be changed into another prime (221225351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110612525 + 110612526.

It is an arithmetic number, because the mean of its divisors is an integer number (110612526).

Almost surely, 2^221225051 is an apocalyptic number.

221225051 is a deficient number, since it is larger than the sum of its proper divisors (1).

221225051 is an equidigital number, since it uses as much as digits as its factorization.

221225051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 221225051 is about 14873.6361055392. The cubic root of 221225051 is about 604.7995155667.

Adding to 221225051 its reverse (150522122), we get a palindrome (371747173).

The spelling of 221225051 in words is "two hundred twenty-one million, two hundred twenty-five thousand, fifty-one".