20121219187 has 2 divisors, whose sum is σ = 20121219188. Its totient is φ = 20121219186.

The previous prime is 20121219149. The next prime is 20121219199. The reversal of 20121219187 is 78191212102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20121219187 - 2⁷ = 20121219059 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121219487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060609593 + 10060609594.

It is an arithmetic number, because the mean of its divisors is an integer number (10060609594).

Almost surely, 2^20121219187 is an apocalyptic number.

20121219187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121219187 is an equidigital number, since it uses as much as digits as its factorization.

20121219187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 20121219187 in words is "twenty billion, one hundred twenty-one million, two hundred nineteen thousand, one hundred eighty-seven".