221323412440 has 64 divisors (see below), whose sum is σ = 536746240800. Its totient is φ = 81648924672.

The previous prime is 221323412419. The next prime is 221323412467. The reversal of 221323412440 is 44214323122.

It is a junction number, because it is equal to n+sod(n) for n = 221323412399 and 221323412408.

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, 421776 + ... + 787744.

Almost surely, 2^221323412440 is an apocalyptic number.

221323412440 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 221323412440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268373120400).

221323412440 is an abundant number, since it is smaller than the sum of its proper divisors (315422828360).

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

221323412440 is a wasteful number, since it uses less digits than its factorization.

221323412440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367156 (or 367152 counting only the distinct ones).

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

Adding to 221323412440 its reverse (44214323122), we get a palindrome (265537735562).

The spelling of 221323412440 in words is "two hundred twenty-one billion, three hundred twenty-three million, four hundred twelve thousand, four hundred forty".