121698851 has 2 divisors, whose sum is σ = 121698852. Its totient is φ = 121698850.

The previous prime is 121698823. The next prime is 121698919. The reversal of 121698851 is 158896121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121698851 - 2¹⁰ = 121697827 is a prime.

It is a super-2 number, since 2×121698851² = 29621220669440402, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121698799 and 121698808.

It is not a weakly prime, because it can be changed into another prime (121694851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60849425 + 60849426.

It is an arithmetic number, because the mean of its divisors is an integer number (60849426).

Almost surely, 2^121698851 is an apocalyptic number.

121698851 is a deficient number, since it is larger than the sum of its proper divisors (1).

121698851 is an equidigital number, since it uses as much as digits as its factorization.

121698851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 41.

The square root of 121698851 is about 11031.7202194399. The cubic root of 121698851 is about 495.5591423386.

The spelling of 121698851 in words is "one hundred twenty-one million, six hundred ninety-eight thousand, eight hundred fifty-one".