121113201981 has 8 divisors (see below), whose sum is σ = 161526524800. Its totient is φ = 80721006912.

The previous prime is 121113201959. The next prime is 121113202009. The reversal of 121113201981 is 189102311121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121113201981 - 2⁶ = 121113201917 is a prime.

It is a super-2 number, since 2×121113201981² (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 (121113201941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5268556 + ... + 5291493.

It is an arithmetic number, because the mean of its divisors is an integer number (20190815600).

Almost surely, 2^121113201981 is an apocalyptic number.

It is an amenable number.

121113201981 is a deficient number, since it is larger than the sum of its proper divisors (40413322819).

121113201981 is a wasteful number, since it uses less digits than its factorization.

121113201981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10563875.

The product of its (nonzero) digits is 864, while the sum is 30.

The spelling of 121113201981 in words is "one hundred twenty-one billion, one hundred thirteen million, two hundred one thousand, nine hundred eighty-one".