221220111000 has 128 divisors (see below), whose sum is σ = 788807784960. Its totient is φ = 50564592000.

The previous prime is 221220110987. The next prime is 221220111043. The reversal of 221220111000 is 111022122.

It is a super-3 number, since 3×221220111000³ (a number of 35 digits) contains 333 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5246146 + ... + 5288145.

It is an arithmetic number, because the mean of its divisors is an integer number (6162560820).

Almost surely, 2^221220111000 is an apocalyptic number.

221220111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220111000 is an abundant number, since it is smaller than the sum of its proper divisors (567587673960).

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

221220111000 is a wasteful number, since it uses less digits than its factorization.

221220111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10534322 (or 10534308 counting only the distinct ones).

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

Adding to 221220111000 its reverse (111022122), we get a palindrome (221331133122).

The spelling of 221220111000 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand".