1221322224 has 20 divisors (see below), whose sum is σ = 3155082536. Its totient is φ = 407107392.

The previous prime is 1221322127. The next prime is 1221322231. The reversal of 1221322224 is 4222231221.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1221322224.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12722059 + ... + 12722154.

Almost surely, 2^1221322224 is an apocalyptic number.

It is an amenable number.

1221322224 is an abundant number, since it is smaller than the sum of its proper divisors (1933760312).

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

1221322224 is a wasteful number, since it uses less digits than its factorization.

1221322224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25444224 (or 25444218 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 1221322224 is about 34947.4208490412. The cubic root of 1221322224 is about 1068.9156114481.

Adding to 1221322224 its reverse (4222231221), we get a palindrome (5443553445).

The spelling of 1221322224 in words is "one billion, two hundred twenty-one million, three hundred twenty-two thousand, two hundred twenty-four".