221212261147 has 2 divisors, whose sum is σ = 221212261148. Its totient is φ = 221212261146.

The previous prime is 221212261103. The next prime is 221212261199. The reversal of 221212261147 is 741162212122.

221212261147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221212261147 is a prime.

It is not a weakly prime, because it can be changed into another prime (221212261447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606130573 + 110606130574.

It is an arithmetic number, because the mean of its divisors is an integer number (110606130574).

Almost surely, 2^221212261147 is an apocalyptic number.

221212261147 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212261147 is an equidigital number, since it uses as much as digits as its factorization.

221212261147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

Adding to 221212261147 its reverse (741162212122), we get a palindrome (962374473269).

The spelling of 221212261147 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred sixty-one thousand, one hundred forty-seven".