123211099987 has 2 divisors, whose sum is σ = 123211099988. Its totient is φ = 123211099986.

The previous prime is 123211099943. The next prime is 123211100053. The reversal of 123211099987 is 789990112321.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123211099987 is a prime.

It is a super-2 number, since 2×123211099987² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123211049987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61605549993 + 61605549994.

It is an arithmetic number, because the mean of its divisors is an integer number (61605549994).

Almost surely, 2^123211099987 is an apocalyptic number.

123211099987 is a deficient number, since it is larger than the sum of its proper divisors (1).

123211099987 is an equidigital number, since it uses as much as digits as its factorization.

123211099987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 52.

The spelling of 123211099987 in words is "one hundred twenty-three billion, two hundred eleven million, ninety-nine thousand, nine hundred eighty-seven".