21222201115187 has 2 divisors, whose sum is σ = 21222201115188. Its totient is φ = 21222201115186.

The previous prime is 21222201115183. The next prime is 21222201115223. The reversal of 21222201115187 is 78151110222212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222201115187 - 2² = 21222201115183 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222201115183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611100557593 + 10611100557594.

It is an arithmetic number, because the mean of its divisors is an integer number (10611100557594).

Almost surely, 2^{21222201115187} is an apocalyptic number.

21222201115187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222201115187 is an equidigital number, since it uses as much as digits as its factorization.

21222201115187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 35.

Adding to 21222201115187 its reverse (78151110222212), we get a palindrome (99373311337399).

The spelling of 21222201115187 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred one million, one hundred fifteen thousand, one hundred eighty-seven".