121293955687 has 2 divisors, whose sum is σ = 121293955688. Its totient is φ = 121293955686.

The previous prime is 121293955637. The next prime is 121293955709. The reversal of 121293955687 is 786559392121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121293955687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121293955637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60646977843 + 60646977844.

It is an arithmetic number, because the mean of its divisors is an integer number (60646977844).

Almost surely, 2^121293955687 is an apocalyptic number.

121293955687 is a deficient number, since it is larger than the sum of its proper divisors (1).

121293955687 is an equidigital number, since it uses as much as digits as its factorization.

121293955687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 58.

The spelling of 121293955687 in words is "one hundred twenty-one billion, two hundred ninety-three million, nine hundred fifty-five thousand, six hundred eighty-seven".