221221222147 has 2 divisors, whose sum is σ = 221221222148. Its totient is φ = 221221222146.

The previous prime is 221221222091. The next prime is 221221222151. The reversal of 221221222147 is 741222122122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221221222147 - 2¹⁵ = 221221189379 is a prime.

It is not a weakly prime, because it can be changed into another prime (221221222447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610611073 + 110610611074.

It is an arithmetic number, because the mean of its divisors is an integer number (110610611074).

Almost surely, 2^221221222147 is an apocalyptic number.

221221222147 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221222147 is an equidigital number, since it uses as much as digits as its factorization.

221221222147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 28.

Adding to 221221222147 its reverse (741222122122), we get a palindrome (962443344269).

The spelling of 221221222147 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred forty-seven".