111021211210020 has 48 divisors (see below), whose sum is σ = 310864497608448. Its totient is φ = 29605170016000.

The previous prime is 111021211209977. The next prime is 111021211210087. The reversal of 111021211210020 is 20012112120111.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11506524 + ... + 18826643.

It is an arithmetic number, because the mean of its divisors is an integer number (6476343700176).

Almost surely, 2^{111021211210020} is an apocalyptic number.

111021211210020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111021211210020 is an abundant number, since it is smaller than the sum of its proper divisors (199843286398428).

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

111021211210020 is a wasteful number, since it uses less digits than its factorization.

111021211210020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30394180 (or 30394178 counting only the distinct ones).

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

Adding to 111021211210020 its reverse (20012112120111), we get a palindrome (131033323330131).

The spelling of 111021211210020 in words is "one hundred eleven trillion, twenty-one billion, two hundred eleven million, two hundred ten thousand, twenty".