20001222100187 has 2 divisors, whose sum is σ = 20001222100188. Its totient is φ = 20001222100186.

The previous prime is 20001222100099. The next prime is 20001222100199. The reversal of 20001222100187 is 78100122210002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001222100187 - 2³⁴ = 19984042231003 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001222100487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000611050093 + 10000611050094.

It is an arithmetic number, because the mean of its divisors is an integer number (10000611050094).

Almost surely, 2^{20001222100187} is an apocalyptic number.

20001222100187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001222100187 is an equidigital number, since it uses as much as digits as its factorization.

20001222100187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 20001222100187 its reverse (78100122210002), we get a palindrome (98101344310189).

The spelling of 20001222100187 in words is "twenty trillion, one billion, two hundred twenty-two million, one hundred thousand, one hundred eighty-seven".