21102212211187 has 2 divisors, whose sum is σ = 21102212211188. Its totient is φ = 21102212211186.

The previous prime is 21102212211089. The next prime is 21102212211253. The reversal of 21102212211187 is 78111221220112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21102212211187 - 2¹¹ = 21102212209139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102212212187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551106105593 + 10551106105594.

It is an arithmetic number, because the mean of its divisors is an integer number (10551106105594).

Almost surely, 2^{21102212211187} is an apocalyptic number.

21102212211187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102212211187 is an equidigital number, since it uses as much as digits as its factorization.

21102212211187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 31.

Adding to 21102212211187 its reverse (78111221220112), we get a palindrome (99213433431299).

The spelling of 21102212211187 in words is "twenty-one trillion, one hundred two billion, two hundred twelve million, two hundred eleven thousand, one hundred eighty-seven".