111111001200020 has 72 divisors (see below), whose sum is σ = 260911537222560. Its totient is φ = 39628443732480.

The previous prime is 111111001199971. The next prime is 111111001200097. The reversal of 111111001200020 is 20002100111111.

It is a junction number, because it is equal to n+sod(n) for n = 111111001199974 and 111111001200010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 505767986 + ... + 505987625.

Almost surely, 2^{111111001200020} is an apocalyptic number.

111111001200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111001200020 is an abundant number, since it is smaller than the sum of its proper divisors (149800536022540).

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

111111001200020 is a wasteful number, since it uses less digits than its factorization.

111111001200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011755673 (or 1011755654 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 111111001200020 its reverse (20002100111111), we get a palindrome (131113101311131).

The spelling of 111111001200020 in words is "one hundred eleven trillion, one hundred eleven billion, one million, two hundred thousand, twenty".