111212001000 has 256 divisors, whose sum is σ = 388957420800. Its totient is φ = 29393280000.

The previous prime is 111212000959. The next prime is 111212001001. The reversal of 111212001000 is 100212111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (111212001001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3032775 + ... + 3069225.

It is an arithmetic number, because the mean of its divisors is an integer number (1519364925).

Almost surely, 2^111212001000 is an apocalyptic number.

111212001000 is a gapful number since it is divisible by the number (10) 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 111212001000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194478710400).

111212001000 is an abundant number, since it is smaller than the sum of its proper divisors (277745419800).

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

111212001000 is a wasteful number, since it uses less digits than its factorization.

111212001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36594 (or 36574 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 111212001000 its reverse (100212111), we get a palindrome (111312213111).

The spelling of 111212001000 in words is "one hundred eleven billion, two hundred twelve million, one thousand".