111212121212010 has 768 divisors, whose sum is σ = 370159064690688. Its totient is φ = 22540446720000.

The previous prime is 111212121211991. The next prime is 111212121212011. The reversal of 111212121212010 is 10212121212111.

It is a happy number.

111212121212010 is a `hidden beast` number, since 11 + 121 + 212 + 121 + 201 + 0 = 666.

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 (111212121212011) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 11232408060 + ... + 11232417960.

It is an arithmetic number, because the mean of its divisors is an integer number (481977948816).

Almost surely, 2^{111212121212010} is an apocalyptic number.

111212121212010 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 111212121212010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185079532345344).

111212121212010 is an abundant number, since it is smaller than the sum of its proper divisors (258946943478678).

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

111212121212010 is a wasteful number, since it uses less digits than its factorization.

111212121212010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10439 (or 10436 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111212121212010 its reverse (10212121212111), we get a palindrome (121424242424121).

The spelling of 111212121212010 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, ten".