111021211100020 has 96 divisors (see below), whose sum is σ = 257993978393088. Its totient is φ = 39874130122752.

The previous prime is 111021211099999. The next prime is 111021211100027. The reversal of 111021211100020 is 20001112120111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021211100027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25876869 + ... + 29860588.

It is an arithmetic number, because the mean of its divisors is an integer number (2687437274928).

Almost surely, 2^{111021211100020} is an apocalyptic number.

111021211100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111021211100020 is an abundant number, since it is smaller than the sum of its proper divisors (146972767293068).

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

111021211100020 is a wasteful number, since it uses less digits than its factorization.

111021211100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55737689 (or 55737687 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111021211100020 its reverse (20001112120111), we get a palindrome (131022323220131).

The spelling of 111021211100020 in words is "one hundred eleven trillion, twenty-one billion, two hundred eleven million, one hundred thousand, twenty".