21222201111247 has 2 divisors, whose sum is σ = 21222201111248. Its totient is φ = 21222201111246.

The previous prime is 21222201111203. The next prime is 21222201111253. The reversal of 21222201111247 is 74211110222212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21222201111247 - 2²⁷ = 21222066893519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222201151247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611100555623 + 10611100555624.

It is an arithmetic number, because the mean of its divisors is an integer number (10611100555624).

Almost surely, 2^{21222201111247} is an apocalyptic number.

21222201111247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222201111247 is an equidigital number, since it uses as much as digits as its factorization.

21222201111247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 28.

Adding to 21222201111247 its reverse (74211110222212), we get a palindrome (95433311333459).

The spelling of 21222201111247 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred one million, one hundred eleven thousand, two hundred forty-seven".