121112010011981 has 4 divisors (see below), whose sum is σ = 123397142276412. Its totient is φ = 118826877747552.

The previous prime is 121112010011957. The next prime is 121112010012031. The reversal of 121112010011981 is 189110010211121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105149827639081 + 15962182372900 = 10254259^2 + 3995270^2 .

It is a cyclic number.

It is not a de Polignac number, because 121112010011981 - 2⁴² = 116713963500877 is a prime.

It is a super-2 number, since 2×121112010011981² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112010011921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1142566132136 + ... + 1142566132241.

It is an arithmetic number, because the mean of its divisors is an integer number (30849285569103).

Almost surely, 2^{121112010011981} is an apocalyptic number.

It is an amenable number.

121112010011981 is a deficient number, since it is larger than the sum of its proper divisors (2285132264431).

121112010011981 is an equidigital number, since it uses as much as digits as its factorization.

121112010011981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285132264430.

The product of its (nonzero) digits is 288, while the sum is 29.

The spelling of 121112010011981 in words is "one hundred twenty-one trillion, one hundred twelve billion, ten million, eleven thousand, nine hundred eighty-one".