20121103187 has 2 divisors, whose sum is σ = 20121103188. Its totient is φ = 20121103186.

The previous prime is 20121103183. The next prime is 20121103229. The reversal of 20121103187 is 78130112102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121103187 - 2² = 20121103183 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121103181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060551593 + 10060551594.

It is an arithmetic number, because the mean of its divisors is an integer number (10060551594).

Almost surely, 2^20121103187 is an apocalyptic number.

20121103187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121103187 is an equidigital number, since it uses as much as digits as its factorization.

20121103187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

Adding to 20121103187 its reverse (78130112102), we get a palindrome (98251215289).

The spelling of 20121103187 in words is "twenty billion, one hundred twenty-one million, one hundred three thousand, one hundred eighty-seven".