221431243220 has 48 divisors (see below), whose sum is σ = 507389351616. Its totient is φ = 80502912000.

The previous prime is 221431243217. The next prime is 221431243283. The reversal of 221431243220 is 22342134122.

It is a self number, because there is not a number n which added to its sum of digits gives 221431243220.

It is a congruent number.

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, 924740 + ... + 1139300.

It is an arithmetic number, because the mean of its divisors is an integer number (10570611492).

Almost surely, 2^221431243220 is an apocalyptic number.

221431243220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221431243220 is an abundant number, since it is smaller than the sum of its proper divisors (285958108396).

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

221431243220 is a wasteful number, since it uses less digits than its factorization.

221431243220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219272 (or 219270 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 221431243220 its reverse (22342134122), we get a palindrome (243773377342).

The spelling of 221431243220 in words is "two hundred twenty-one billion, four hundred thirty-one million, two hundred forty-three thousand, two hundred twenty".