121859001881 has 2 divisors, whose sum is σ = 121859001882. Its totient is φ = 121859001880.

The previous prime is 121859001853. The next prime is 121859001893. The reversal of 121859001881 is 188100958121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69867705625 + 51991296256 = 264325^2 + 228016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121859001881 is a prime.

It is a super-2 number, since 2×121859001881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121859001811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60929500940 + 60929500941.

It is an arithmetic number, because the mean of its divisors is an integer number (60929500941).

Almost surely, 2^121859001881 is an apocalyptic number.

It is an amenable number.

121859001881 is a deficient number, since it is larger than the sum of its proper divisors (1).

121859001881 is an equidigital number, since it uses as much as digits as its factorization.

121859001881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 44.

The spelling of 121859001881 in words is "one hundred twenty-one billion, eight hundred fifty-nine million, one thousand, eight hundred eighty-one".