221213432440 has 128 divisors (see below), whose sum is σ = 668281259520. Its totient is φ = 63645811200.

The previous prime is 221213432431. The next prime is 221213432459. The reversal of 221213432440 is 44234312122.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 221213432399 and 221213432408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2722366 + ... + 2802445.

It is an arithmetic number, because the mean of its divisors is an integer number (5220947340).

Almost surely, 2^221213432440 is an apocalyptic number.

221213432440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221213432440 is an abundant number, since it is smaller than the sum of its proper divisors (447067827080).

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

221213432440 is a wasteful number, since it uses less digits than its factorization.

221213432440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5524853 (or 5524849 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 221213432440 its reverse (44234312122), we get a palindrome (265447744562).

The spelling of 221213432440 in words is "two hundred twenty-one billion, two hundred thirteen million, four hundred thirty-two thousand, four hundred forty".