121216687 has 2 divisors, whose sum is σ = 121216688. Its totient is φ = 121216686.

The previous prime is 121216673. The next prime is 121216691. The reversal of 121216687 is 786612121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121216687 - 2⁷ = 121216559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121211687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60608343 + 60608344.

It is an arithmetic number, because the mean of its divisors is an integer number (60608344).

Almost surely, 2^121216687 is an apocalyptic number.

121216687 is a deficient number, since it is larger than the sum of its proper divisors (1).

121216687 is an equidigital number, since it uses as much as digits as its factorization.

121216687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 121216687 is about 11009.8450034503. The cubic root of 121216687 is about 494.9038169750.

The spelling of 121216687 in words is "one hundred twenty-one million, two hundred sixteen thousand, six hundred eighty-seven".