121866402731 has 2 divisors, whose sum is σ = 121866402732. Its totient is φ = 121866402730.

The previous prime is 121866402719. The next prime is 121866402751. The reversal of 121866402731 is 137204668121.

It is a weak prime.

It is an emirp because it is prime and its reverse (137204668121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121866402731 - 2¹⁰ = 121866401707 is a prime.

It is a super-2 number, since 2×121866402731² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121866402751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60933201365 + 60933201366.

It is an arithmetic number, because the mean of its divisors is an integer number (60933201366).

Almost surely, 2^121866402731 is an apocalyptic number.

121866402731 is a deficient number, since it is larger than the sum of its proper divisors (1).

121866402731 is an equidigital number, since it uses as much as digits as its factorization.

121866402731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 121866402731 in words is "one hundred twenty-one billion, eight hundred sixty-six million, four hundred two thousand, seven hundred thirty-one".