1212312221987 has 2 divisors, whose sum is σ = 1212312221988. Its totient is φ = 1212312221986.

The previous prime is 1212312221983. The next prime is 1212312222047. The reversal of 1212312221987 is 7891222132121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212312221987 - 2² = 1212312221983 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212312221983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606156110993 + 606156110994.

It is an arithmetic number, because the mean of its divisors is an integer number (606156110994).

Almost surely, 2^{1212312221987} is an apocalyptic number.

1212312221987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212312221987 is an equidigital number, since it uses as much as digits as its factorization.

1212312221987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The spelling of 1212312221987 in words is "one trillion, two hundred twelve billion, three hundred twelve million, two hundred twenty-one thousand, nine hundred eighty-seven".