221210044420 has 24 divisors (see below), whose sum is σ = 464563575000. Its totient is φ = 88479735552.

The previous prime is 221210044411. The next prime is 221210044457. The reversal of 221210044420 is 24440012122.

It can be written as a sum of positive squares in 4 ways, for example, as 1189008324 + 220021036096 = 34482^2 + 469064^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221210044391 and 221210044400.

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, 173706 + ... + 687454.

It is an arithmetic number, because the mean of its divisors is an integer number (19356815625).

Almost surely, 2^221210044420 is an apocalyptic number.

221210044420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221210044420 is an abundant number, since it is smaller than the sum of its proper divisors (243353530580).

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

221210044420 is a wasteful number, since it uses less digits than its factorization.

221210044420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535287 (or 535285 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 221210044420 its reverse (24440012122), we get a palindrome (245650056542).

The spelling of 221210044420 in words is "two hundred twenty-one billion, two hundred ten million, forty-four thousand, four hundred twenty".