1221888224 has 12 divisors (see below), whose sum is σ = 2405592504. Its totient is φ = 610944096.

The previous prime is 1221888223. The next prime is 1221888251. The reversal of 1221888224 is 4228881221.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221888223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19091972 + ... + 19092035.

It is an arithmetic number, because the mean of its divisors is an integer number (200466042).

Almost surely, 2^1221888224 is an apocalyptic number.

It is an amenable number.

1221888224 is a deficient number, since it is larger than the sum of its proper divisors (1183704280).

1221888224 is an equidigital number, since it uses as much as digits as its factorization.

1221888224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38184017 (or 38184009 counting only the distinct ones).

The product of its digits is 32768, while the sum is 38.

The square root of 1221888224 is about 34955.5177904719. The cubic root of 1221888224 is about 1069.0807092382.

The spelling of 1221888224 in words is "one billion, two hundred twenty-one million, eight hundred eighty-eight thousand, two hundred twenty-four".