121653790187 has 2 divisors, whose sum is σ = 121653790188. Its totient is φ = 121653790186.

The previous prime is 121653790067. The next prime is 121653790189. The reversal of 121653790187 is 781097356121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121653790187 - 2¹² = 121653786091 is a prime.

Together with 121653790189, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121653790189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60826895093 + 60826895094.

It is an arithmetic number, because the mean of its divisors is an integer number (60826895094).

Almost surely, 2^121653790187 is an apocalyptic number.

121653790187 is a deficient number, since it is larger than the sum of its proper divisors (1).

121653790187 is an equidigital number, since it uses as much as digits as its factorization.

121653790187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 50.

The spelling of 121653790187 in words is "one hundred twenty-one billion, six hundred fifty-three million, seven hundred ninety thousand, one hundred eighty-seven".