121999994827 has 2 divisors, whose sum is σ = 121999994828. Its totient is φ = 121999994826.

The previous prime is 121999994813. The next prime is 121999994833. The reversal of 121999994827 is 728499999121.

It is a strong prime.

It is an emirp because it is prime and its reverse (728499999121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121999994827 - 2¹⁹ = 121999470539 is a prime.

It is not a weakly prime, because it can be changed into another prime (121999994027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60999997413 + 60999997414.

It is an arithmetic number, because the mean of its divisors is an integer number (60999997414).

Almost surely, 2^121999994827 is an apocalyptic number.

121999994827 is a deficient number, since it is larger than the sum of its proper divisors (1).

121999994827 is an equidigital number, since it uses as much as digits as its factorization.

121999994827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52907904, while the sum is 70.

The spelling of 121999994827 in words is "one hundred twenty-one billion, nine hundred ninety-nine million, nine hundred ninety-four thousand, eight hundred twenty-seven".