21222442144 has 12 divisors (see below), whose sum is σ = 41781683034. Its totient is φ = 10611221056.

The previous prime is 21222442123. The next prime is 21222442151. The reversal of 21222442144 is 44124422212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21144649744 + 77792400 = 145412^2 + 8820^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331600627 + ... + 331600690.

Almost surely, 2^21222442144 is an apocalyptic number.

It is an amenable number.

21222442144 is a deficient number, since it is larger than the sum of its proper divisors (20559240890).

21222442144 is an equidigital number, since it uses as much as digits as its factorization.

21222442144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663201327 (or 663201319 counting only the distinct ones).

The product of its digits is 8192, while the sum is 28.

Adding to 21222442144 its reverse (44124422212), we get a palindrome (65346864356).

The spelling of 21222442144 in words is "twenty-one billion, two hundred twenty-two million, four hundred forty-two thousand, one hundred forty-four".