221111121120 has 48 divisors (see below), whose sum is σ = 696500033040. Its totient is φ = 58962965504.

The previous prime is 221111121103. The next prime is 221111121157. The reversal of 221111121120 is 21121111122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is a self number, because there is not a number n which added to its sum of digits gives 221111121120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230323605 + ... + 230324564.

It is an arithmetic number, because the mean of its divisors is an integer number (14510417355).

Almost surely, 2^221111121120 is an apocalyptic number.

221111121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221111121120 is an abundant number, since it is smaller than the sum of its proper divisors (475388911920).

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

221111121120 is a wasteful number, since it uses less digits than its factorization.

221111121120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460648187 (or 460648179 counting only the distinct ones).

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

Adding to 221111121120 its reverse (21121111122), we get a palindrome (242232232242).

The spelling of 221111121120 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, one hundred twenty".