121212111930 has 192 divisors, whose sum is σ = 365409128448. Its totient is φ = 25506109440.

The previous prime is 121212111899. The next prime is 121212111931. The reversal of 121212111930 is 39111212121.

It is a self number, because there is not a number n which added to its sum of digits gives 121212111930.

It is not an unprimeable number, because it can be changed into a prime (121212111931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7310850 + ... + 7327410.

It is an arithmetic number, because the mean of its divisors is an integer number (1903172544).

Almost surely, 2^121212111930 is an apocalyptic number.

121212111930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121212111930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182704564224).

121212111930 is an abundant number, since it is smaller than the sum of its proper divisors (244197016518).

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

121212111930 is a wasteful number, since it uses less digits than its factorization.

121212111930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16981 (or 16974 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 24.

The spelling of 121212111930 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, nine hundred thirty".