21144124444 has 12 divisors (see below), whose sum is σ = 37027212768. Its totient is φ = 10564920800.

The previous prime is 21144124429. The next prime is 21144124453. The reversal of 21144124444 is 44442144112.

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 in 3 ways as a sum of consecutive naturals, for example, 1778692 + ... + 1790539.

It is an arithmetic number, because the mean of its divisors is an integer number (3085601064).

Almost surely, 2^21144124444 is an apocalyptic number.

It is an amenable number.

21144124444 is a deficient number, since it is larger than the sum of its proper divisors (15883088324).

21144124444 is a wasteful number, since it uses less digits than its factorization.

21144124444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570716 (or 3570714 counting only the distinct ones).

The product of its digits is 16384, while the sum is 31.

Adding to 21144124444 its reverse (44442144112), we get a palindrome (65586268556).

The spelling of 21144124444 in words is "twenty-one billion, one hundred forty-four million, one hundred twenty-four thousand, four hundred forty-four".