121706366491 has 2 divisors, whose sum is σ = 121706366492. Its totient is φ = 121706366490.

The previous prime is 121706366479. The next prime is 121706366497. The reversal of 121706366491 is 194663607121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121706366491 - 2⁷ = 121706366363 is a prime.

It is not a weakly prime, because it can be changed into another prime (121706366497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60853183245 + 60853183246.

It is an arithmetic number, because the mean of its divisors is an integer number (60853183246).

Almost surely, 2^121706366491 is an apocalyptic number.

121706366491 is a deficient number, since it is larger than the sum of its proper divisors (1).

121706366491 is an equidigital number, since it uses as much as digits as its factorization.

121706366491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 121706366491 in words is "one hundred twenty-one billion, seven hundred six million, three hundred sixty-six thousand, four hundred ninety-one".