221220001220 has 24 divisors (see below), whose sum is σ = 470442537600. Its totient is φ = 87367898592.

The previous prime is 221220001181. The next prime is 221220001231. The reversal of 221220001220 is 22100022122.

221220001220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221220001195 and 221220001204.

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 7 ways as a sum of consecutive naturals, for example, 70004750 + ... + 70007909.

It is an arithmetic number, because the mean of its divisors is an integer number (19601772400).

Almost surely, 2^221220001220 is an apocalyptic number.

221220001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220001220 is an abundant number, since it is smaller than the sum of its proper divisors (249222536380).

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

221220001220 is a wasteful number, since it uses less digits than its factorization.

221220001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140012747 (or 140012745 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 221220001220 its reverse (22100022122), we get a palindrome (243320023342).

The spelling of 221220001220 in words is "two hundred twenty-one billion, two hundred twenty million, one thousand, two hundred twenty".