121222021219987 has 2 divisors, whose sum is σ = 121222021219988. Its totient is φ = 121222021219986.

The previous prime is 121222021219961. The next prime is 121222021220039. The reversal of 121222021219987 is 789912120222121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121222021219987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121222021219987.

It is not a weakly prime, because it can be changed into another prime (121222021219787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60611010609993 + 60611010609994.

It is an arithmetic number, because the mean of its divisors is an integer number (60611010609994).

Almost surely, 2^{121222021219987} is an apocalyptic number.

121222021219987 is a deficient number, since it is larger than the sum of its proper divisors (1).

121222021219987 is an equidigital number, since it uses as much as digits as its factorization.

121222021219987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 49.

The spelling of 121222021219987 in words is "one hundred twenty-one trillion, two hundred twenty-two billion, twenty-one million, two hundred nineteen thousand, nine hundred eighty-seven".