121220011982 has 4 divisors (see below), whose sum is σ = 181830017976. Its totient is φ = 60610005990.

The previous prime is 121220011981. The next prime is 121220011987. The reversal of 121220011982 is 289110022121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 289110022121 = 5783 ⋅49993087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220011981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30305002994 + ... + 30305002997.

It is an arithmetic number, because the mean of its divisors is an integer number (45457504494).

Almost surely, 2^121220011982 is an apocalyptic number.

121220011982 is a deficient number, since it is larger than the sum of its proper divisors (60610005994).

121220011982 is an equidigital number, since it uses as much as digits as its factorization.

121220011982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60610005993.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 121220011982 in words is "one hundred twenty-one billion, two hundred twenty million, eleven thousand, nine hundred eighty-two".