121203311112 has 192 divisors, whose sum is σ = 379046304000. Its totient is φ = 34654943232.

The previous prime is 121203311111. The next prime is 121203311137. The reversal of 121203311112 is 211113302121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (121203311111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1208839 + ... + 1305257.

It is an arithmetic number, because the mean of its divisors is an integer number (1974199500).

Almost surely, 2^121203311112 is an apocalyptic number.

121203311112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121203311112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189523152000).

121203311112 is an abundant number, since it is smaller than the sum of its proper divisors (257842992888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121203311112 is a wasteful number, since it uses less digits than its factorization.

121203311112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96540 (or 96533 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 121203311112 its reverse (211113302121), we get a palindrome (332316613233).

The spelling of 121203311112 in words is "one hundred twenty-one billion, two hundred three million, three hundred eleven thousand, one hundred twelve".