121999937887 has 2 divisors, whose sum is σ = 121999937888. Its totient is φ = 121999937886.

The previous prime is 121999937833. The next prime is 121999937893. The reversal of 121999937887 is 788739999121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121999937887 - 2¹¹ = 121999935839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121999937287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60999968943 + 60999968944.

It is an arithmetic number, because the mean of its divisors is an integer number (60999968944).

Almost surely, 2^121999937887 is an apocalyptic number.

121999937887 is a deficient number, since it is larger than the sum of its proper divisors (1).

121999937887 is an equidigital number, since it uses as much as digits as its factorization.

121999937887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123451776, while the sum is 73.

The spelling of 121999937887 in words is "one hundred twenty-one billion, nine hundred ninety-nine million, nine hundred thirty-seven thousand, eight hundred eighty-seven".