221031120 has 40 divisors (see below), whose sum is σ = 685197216. Its totient is φ = 58941568.

The previous prime is 221031119. The next prime is 221031143. The reversal of 221031120 is 21130122.

221031120 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

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 = 221031096 and 221031105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460242 + ... + 460721.

Almost surely, 2^221031120 is an apocalyptic number.

221031120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221031120 is an abundant number, since it is smaller than the sum of its proper divisors (464166096).

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

221031120 is a wasteful number, since it uses less digits than its factorization.

221031120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920979 (or 920973 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 221031120 is about 14867.1153893417. The cubic root of 221031120 is about 604.6227368160.

Adding to 221031120 its reverse (21130122), we get a palindrome (242161242).

The spelling of 221031120 in words is "two hundred twenty-one million, thirty-one thousand, one hundred twenty".