221240304220 has 96 divisors (see below), whose sum is σ = 507018193920. Its totient is φ = 80600382720.

The previous prime is 221240304211. The next prime is 221240304251. The reversal of 221240304220 is 22403042122.

It is a super-2 number, since 2×221240304220² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221240304191 and 221240304200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42782235 + ... + 42787405.

It is an arithmetic number, because the mean of its divisors is an integer number (5281439520).

Almost surely, 2^221240304220 is an apocalyptic number.

221240304220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221240304220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253509096960).

221240304220 is an abundant number, since it is smaller than the sum of its proper divisors (285777889700).

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

221240304220 is a wasteful number, since it uses less digits than its factorization.

221240304220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7355 (or 7353 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 221240304220 its reverse (22403042122), we get a palindrome (243643346342).

The spelling of 221240304220 in words is "two hundred twenty-one billion, two hundred forty million, three hundred four thousand, two hundred twenty".