111211100020020 has 192 divisors, whose sum is σ = 418091520301056. Its totient is φ = 21331199992320.

The previous prime is 111211100019983. The next prime is 111211100020037. The reversal of 111211100020020 is 20020001112111.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 111211100019978 and 111211100020005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 925773274 + ... + 925893393.

It is an arithmetic number, because the mean of its divisors is an integer number (2177560001568).

Almost surely, 2^{111211100020020} is an apocalyptic number.

111211100020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111211100020020 is an abundant number, since it is smaller than the sum of its proper divisors (306880420281036).

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

111211100020020 is a wasteful number, since it uses less digits than its factorization.

111211100020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851666710 (or 1851666708 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111211100020020 its reverse (20020001112111), we get a palindrome (131231101132131).

The spelling of 111211100020020 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred million, twenty thousand, twenty".