111221212001100 has 72 divisors (see below), whose sum is σ = 322292843135760. Its totient is φ = 29613570228480.

The previous prime is 111221212001063. The next prime is 111221212001101. The reversal of 111221212001100 is 1100212122111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 111221212001100.

It is not an unprimeable number, because it can be changed into a prime (111221212001101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 283676515 + ... + 284068314.

Almost surely, 2^{111221212001100} is an apocalyptic number.

111221212001100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221212001100 is an abundant number, since it is smaller than the sum of its proper divisors (211071631134660).

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

111221212001100 is a wasteful number, since it uses less digits than its factorization.

111221212001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567745499 (or 567745492 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111221212001100 its reverse (1100212122111), we get a palindrome (112321424123211).

The spelling of 111221212001100 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, one thousand, one hundred".