20021110111187 has 2 divisors, whose sum is σ = 20021110111188. Its totient is φ = 20021110111186.

The previous prime is 20021110111183. The next prime is 20021110111297. The reversal of 20021110111187 is 78111101112002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021110111187 - 2² = 20021110111183 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021110111183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010555055593 + 10010555055594.

It is an arithmetic number, because the mean of its divisors is an integer number (10010555055594).

Almost surely, 2^{20021110111187} is an apocalyptic number.

20021110111187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021110111187 is an equidigital number, since it uses as much as digits as its factorization.

20021110111187 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 26.

Adding to 20021110111187 its reverse (78111101112002), we get a palindrome (98132211223189).

The spelling of 20021110111187 in words is "twenty trillion, twenty-one billion, one hundred ten million, one hundred eleven thousand, one hundred eighty-seven".