221200111020 has 144 divisors (see below), whose sum is σ = 720944098560. Its totient is φ = 50527483776.

The previous prime is 221200111007. The next prime is 221200111031. The reversal of 221200111020 is 20111002122.

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 = 221200110987 and 221200111005.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4701171 + ... + 4747989.

It is an arithmetic number, because the mean of its divisors is an integer number (5006556240).

Almost surely, 2^221200111020 is an apocalyptic number.

221200111020 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 221200111020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360472049280).

221200111020 is an abundant number, since it is smaller than the sum of its proper divisors (499743987540).

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

221200111020 is a wasteful number, since it uses less digits than its factorization.

221200111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48452 (or 48443 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221200111020 its reverse (20111002122), we get a palindrome (241311113142).

The spelling of 221200111020 in words is "two hundred twenty-one billion, two hundred million, one hundred eleven thousand, twenty".