221311223340 has 48 divisors (see below), whose sum is σ = 619692011232. Its totient is φ = 59014365696.

The previous prime is 221311223339. The next prime is 221311223363. The reversal of 221311223340 is 43322113122.

It is a self number, because there is not a number n which added to its sum of digits gives 221311223340.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3157152 + ... + 3226488.

It is an arithmetic number, because the mean of its divisors is an integer number (12910250234).

Almost surely, 2^221311223340 is an apocalyptic number.

221311223340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221311223340 is an abundant number, since it is smaller than the sum of its proper divisors (398380787892).

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

221311223340 is a wasteful number, since it uses less digits than its factorization.

221311223340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122546 (or 122544 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 221311223340 its reverse (43322113122), we get a palindrome (264633336462).

The spelling of 221311223340 in words is "two hundred twenty-one billion, three hundred eleven million, two hundred twenty-three thousand, three hundred forty".