221011112111020 has 144 divisors (see below), whose sum is σ = 583884629846784. Its totient is φ = 68785717968000.

The previous prime is 221011112110991. The next prime is 221011112111033. The reversal of 221011112111020 is 20111211110122.

It is a junction number, because it is equal to n+sod(n) for n = 221011112110985 and 221011112111003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2018995 + ... + 21121045.

It is an arithmetic number, because the mean of its divisors is an integer number (4054754373936).

Almost surely, 2^{221011112111020} is an apocalyptic number.

221011112111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221011112111020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291942314923392).

221011112111020 is an abundant number, since it is smaller than the sum of its proper divisors (362873517735764).

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

221011112111020 is a wasteful number, since it uses less digits than its factorization.

221011112111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19102772 (or 19102759 counting only the distinct ones).

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

Adding to 221011112111020 its reverse (20111211110122), we get a palindrome (241122323221142).

The spelling of 221011112111020 in words is "two hundred twenty-one trillion, eleven billion, one hundred twelve million, one hundred eleven thousand, twenty".