20121211210187 has 2 divisors, whose sum is σ = 20121211210188. Its totient is φ = 20121211210186.

The previous prime is 20121211210181. The next prime is 20121211210223. The reversal of 20121211210187 is 78101211212102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121211210187 - 2⁴ = 20121211210171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121211210181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060605605093 + 10060605605094.

It is an arithmetic number, because the mean of its divisors is an integer number (10060605605094).

Almost surely, 2^{20121211210187} is an apocalyptic number.

20121211210187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121211210187 is an equidigital number, since it uses as much as digits as its factorization.

20121211210187 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 29.

Adding to 20121211210187 its reverse (78101211212102), we get a palindrome (98222422422289).

The spelling of 20121211210187 in words is "twenty trillion, one hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, one hundred eighty-seven".