21201112011187 has 2 divisors, whose sum is σ = 21201112011188. Its totient is φ = 21201112011186.

The previous prime is 21201112011071. The next prime is 21201112011199. The reversal of 21201112011187 is 78111021110212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201112011187 - 2²⁷ = 21200977793459 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201112011487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600556005593 + 10600556005594.

It is an arithmetic number, because the mean of its divisors is an integer number (10600556005594).

Almost surely, 2^{21201112011187} is an apocalyptic number.

21201112011187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201112011187 is an equidigital number, since it uses as much as digits as its factorization.

21201112011187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 28.

Adding to 21201112011187 its reverse (78111021110212), we get a palindrome (99312133121399).

The spelling of 21201112011187 in words is "twenty-one trillion, two hundred one billion, one hundred twelve million, eleven thousand, one hundred eighty-seven".