221212261241 has 2 divisors, whose sum is σ = 221212261242. Its totient is φ = 221212261240.

The previous prime is 221212261211. The next prime is 221212261321. The reversal of 221212261241 is 142162212122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146245821241 + 74966440000 = 382421^2 + 273800^2 .

It is a cyclic number.

It is not a de Polignac number, because 221212261241 - 2¹⁸ = 221211999097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221212261241.

It is not a weakly prime, because it can be changed into another prime (221212261211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606130620 + 110606130621.

It is an arithmetic number, because the mean of its divisors is an integer number (110606130621).

Almost surely, 2^221212261241 is an apocalyptic number.

It is an amenable number.

221212261241 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212261241 is an equidigital number, since it uses as much as digits as its factorization.

221212261241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 26.

Adding to 221212261241 its reverse (142162212122), we get a palindrome (363374473363).

The spelling of 221212261241 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred sixty-one thousand, two hundred forty-one".