221212243144427 has 2 divisors, whose sum is σ = 221212243144428. Its totient is φ = 221212243144426.

The previous prime is 221212243144423. The next prime is 221212243144483. The reversal of 221212243144427 is 724441342212122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221212243144427 - 2² = 221212243144423 is a prime.

It is not a weakly prime, because it can be changed into another prime (221212243144423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606121572213 + 110606121572214.

It is an arithmetic number, because the mean of its divisors is an integer number (110606121572214).

Almost surely, 2^{221212243144427} is an apocalyptic number.

221212243144427 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212243144427 is an equidigital number, since it uses as much as digits as its factorization.

221212243144427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 344064, while the sum is 41.

Adding to 221212243144427 its reverse (724441342212122), we get a palindrome (945653585356549).

The spelling of 221212243144427 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred forty-three million, one hundred forty-four thousand, four hundred twenty-seven".