21222144124 has 6 divisors (see below), whose sum is σ = 37138752224. Its totient is φ = 10611072060.

The previous prime is 21222144113. The next prime is 21222144173. The reversal of 21222144124 is 42144122212.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652768012 + ... + 2652768019.

Almost surely, 2^21222144124 is an apocalyptic number.

It is an amenable number.

21222144124 is a deficient number, since it is larger than the sum of its proper divisors (15916608100).

21222144124 is a wasteful number, since it uses less digits than its factorization.

21222144124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305536035 (or 5305536033 counting only the distinct ones).

The product of its digits is 2048, while the sum is 25.

Adding to 21222144124 its reverse (42144122212), we get a palindrome (63366266336).

The spelling of 21222144124 in words is "twenty-one billion, two hundred twenty-two million, one hundred forty-four thousand, one hundred twenty-four".