121771545881 has 2 divisors, whose sum is σ = 121771545882. Its totient is φ = 121771545880.

The previous prime is 121771545871. The next prime is 121771545899. The reversal of 121771545881 is 188545177121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67974918400 + 53796627481 = 260720^2 + 231941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121771545881 is a prime.

It is a super-2 number, since 2×121771545881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121771545871) 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, 60885772940 + 60885772941.

It is an arithmetic number, because the mean of its divisors is an integer number (60885772941).

Almost surely, 2^121771545881 is an apocalyptic number.

It is an amenable number.

121771545881 is a deficient number, since it is larger than the sum of its proper divisors (1).

121771545881 is an equidigital number, since it uses as much as digits as its factorization.

121771545881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 627200, while the sum is 50.

The spelling of 121771545881 in words is "one hundred twenty-one billion, seven hundred seventy-one million, five hundred forty-five thousand, eight hundred eighty-one".