21222221211263 has 2 divisors, whose sum is σ = 21222221211264. Its totient is φ = 21222221211262.

The previous prime is 21222221211221. The next prime is 21222221211437. The reversal of 21222221211263 is 36211212222212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222221211263 - 2⁸ = 21222221211007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222221210263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611110605631 + 10611110605632.

It is an arithmetic number, because the mean of its divisors is an integer number (10611110605632).

Almost surely, 2^{21222221211263} is an apocalyptic number.

21222221211263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222221211263 is an equidigital number, since it uses as much as digits as its factorization.

21222221211263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 29.

Adding to 21222221211263 its reverse (36211212222212), we get a palindrome (57433433433475).

The spelling of 21222221211263 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred eleven thousand, two hundred sixty-three".