123221212187 has 2 divisors, whose sum is σ = 123221212188. Its totient is φ = 123221212186.

The previous prime is 123221212133. The next prime is 123221212229. The reversal of 123221212187 is 781212122321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123221212187 is a prime.

It is not a weakly prime, because it can be changed into another prime (123221212687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61610606093 + 61610606094.

It is an arithmetic number, because the mean of its divisors is an integer number (61610606094).

Almost surely, 2^123221212187 is an apocalyptic number.

123221212187 is a deficient number, since it is larger than the sum of its proper divisors (1).

123221212187 is an equidigital number, since it uses as much as digits as its factorization.

123221212187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 32.

The spelling of 123221212187 in words is "one hundred twenty-three billion, two hundred twenty-one million, two hundred twelve thousand, one hundred eighty-seven".