20211187 has 2 divisors, whose sum is σ = 20211188. Its totient is φ = 20211186.

The previous prime is 20211167. The next prime is 20211197. The reversal of 20211187 is 78111202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211187 - 2¹¹ = 20209139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20211127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105593 + 10105594.

It is an arithmetic number, because the mean of its divisors is an integer number (10105594).

Almost surely, 2^20211187 is an apocalyptic number.

20211187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211187 is an equidigital number, since it uses as much as digits as its factorization.

20211187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 20211187 is about 4495.6853760022. The cubic root of 20211187 is about 272.3938345799.

Adding to 20211187 its reverse (78111202), we get a palindrome (98322389).

The spelling of 20211187 in words is "twenty million, two hundred eleven thousand, one hundred eighty-seven".