221222342400 has 108 divisors (see below), whose sum is σ = 730079881272. Its totient is φ = 58992619520.

The previous prime is 221222342359. The next prime is 221222342417. The reversal of 221222342400 is 4243222122.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5741799 + ... + 5780198.

Almost surely, 2^221222342400 is an apocalyptic number.

221222342400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222342400 is an abundant number, since it is smaller than the sum of its proper divisors (508857538872).

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

221222342400 is a wasteful number, since it uses less digits than its factorization.

221222342400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11522026 (or 11522007 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 221222342400 its reverse (4243222122), we get a palindrome (225465564522).

The spelling of 221222342400 in words is "two hundred twenty-one billion, two hundred twenty-two million, three hundred forty-two thousand, four hundred".