121354941991 has 2 divisors, whose sum is σ = 121354941992. Its totient is φ = 121354941990.

The previous prime is 121354941977. The next prime is 121354942147. The reversal of 121354941991 is 199149453121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121354941991 - 2²⁵ = 121321387559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121354941941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60677470995 + 60677470996.

It is an arithmetic number, because the mean of its divisors is an integer number (60677470996).

Almost surely, 2^121354941991 is an apocalyptic number.

121354941991 is a deficient number, since it is larger than the sum of its proper divisors (1).

121354941991 is an equidigital number, since it uses as much as digits as its factorization.

121354941991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 49.

The spelling of 121354941991 in words is "one hundred twenty-one billion, three hundred fifty-four million, nine hundred forty-one thousand, nine hundred ninety-one".