121100109881 has 2 divisors, whose sum is σ = 121100109882. Its totient is φ = 121100109880.

The previous prime is 121100109869. The next prime is 121100110009. The reversal of 121100109881 is 188901001121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119359885225 + 1740224656 = 345485^2 + 41716^2 .

It is a cyclic number.

It is not a de Polignac number, because 121100109881 - 2²⁶ = 121033001017 is a prime.

It is a super-2 number, since 2×121100109881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121100102881) 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, 60550054940 + 60550054941.

It is an arithmetic number, because the mean of its divisors is an integer number (60550054941).

Almost surely, 2^121100109881 is an apocalyptic number.

It is an amenable number.

121100109881 is a deficient number, since it is larger than the sum of its proper divisors (1).

121100109881 is an equidigital number, since it uses as much as digits as its factorization.

121100109881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 32.

The spelling of 121100109881 in words is "one hundred twenty-one billion, one hundred million, one hundred nine thousand, eight hundred eighty-one".