21222201111187 has 2 divisors, whose sum is σ = 21222201111188. Its totient is φ = 21222201111186.

The previous prime is 21222201111179. The next prime is 21222201111203. The reversal of 21222201111187 is 78111110222212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222201111187 - 2³ = 21222201111179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222201115187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611100555593 + 10611100555594.

It is an arithmetic number, because the mean of its divisors is an integer number (10611100555594).

Almost surely, 2^{21222201111187} is an apocalyptic number.

21222201111187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222201111187 is an equidigital number, since it uses as much as digits as its factorization.

21222201111187 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 31.

Adding to 21222201111187 its reverse (78111110222212), we get a palindrome (99333311333399).

The spelling of 21222201111187 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred one million, one hundred eleven thousand, one hundred eighty-seven".