221843811306 has 48 divisors (see below), whose sum is σ = 492161019840. Its totient is φ = 66594752640.

The previous prime is 221843811283. The next prime is 221843811307. The reversal of 221843811306 is 603118348122.

It is a super-2 number, since 2×221843811306² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (221843811307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2626486 + ... + 2709633.

It is an arithmetic number, because the mean of its divisors is an integer number (10253354580).

Almost surely, 2^221843811306 is an apocalyptic number.

221843811306 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

221843811306 is an abundant number, since it is smaller than the sum of its proper divisors (270317208534).

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

221843811306 is a wasteful number, since it uses less digits than its factorization.

221843811306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5336191 (or 5336178 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The spelling of 221843811306 in words is "two hundred twenty-one billion, eight hundred forty-three million, eight hundred eleven thousand, three hundred six".