121875305981 has 16 divisors (see below), whose sum is σ = 149407493760. Its totient is φ = 97826329920.

The previous prime is 121875305969. The next prime is 121875305987. The reversal of 121875305981 is 189503578121.

It is a de Polignac number, because none of the positive numbers 2^k-121875305981 is a prime.

It is a super-2 number, since 2×121875305981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121875305987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18524426 + ... + 18531003.

It is an arithmetic number, because the mean of its divisors is an integer number (9337968360).

Almost surely, 2^121875305981 is an apocalyptic number.

121875305981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121875305981 is a deficient number, since it is larger than the sum of its proper divisors (27532187779).

121875305981 is a wasteful number, since it uses less digits than its factorization.

121875305981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37055476.

The product of its (nonzero) digits is 604800, while the sum is 50.

The spelling of 121875305981 in words is "one hundred twenty-one billion, eight hundred seventy-five million, three hundred five thousand, nine hundred eighty-one".