111212001020 has 24 divisors (see below), whose sum is σ = 234522388800. Its totient is φ = 44298669632.

The previous prime is 111212001013. The next prime is 111212001029. The reversal of 111212001020 is 20100212111.

It is a junction number, because it is equal to n+sod(n) for n = 111212000992 and 111212001010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212001029) 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, 11628275 + ... + 11637834.

It is an arithmetic number, because the mean of its divisors is an integer number (9771766200).

Almost surely, 2^111212001020 is an apocalyptic number.

111212001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111212001020 is an abundant number, since it is smaller than the sum of its proper divisors (123310387780).

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

111212001020 is a wasteful number, since it uses less digits than its factorization.

111212001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23266357 (or 23266355 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111212001020 its reverse (20100212111), we get a palindrome (131312213131).

The spelling of 111212001020 in words is "one hundred eleven billion, two hundred twelve million, one thousand, twenty".