21422444444 has 24 divisors (see below), whose sum is σ = 41178157440. Its totient is φ = 9706278384.

The previous prime is 21422444437. The next prime is 21422444473. The reversal of 21422444444 is 44444422412.

It is a super-2 number, since 2×21422444444² (a number of 21 digits) contains 22 as substring.

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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6125954 + ... + 6129449.

It is an arithmetic number, because the mean of its divisors is an integer number (1715756560).

Almost surely, 2^21422444444 is an apocalyptic number.

It is an amenable number.

21422444444 is a deficient number, since it is larger than the sum of its proper divisors (19755712996).

21422444444 is a wasteful number, since it uses less digits than its factorization.

21422444444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12255449 (or 12255447 counting only the distinct ones).

The product of its digits is 131072, while the sum is 35.

Adding to 21422444444 its reverse (44444422412), we get a palindrome (65866866856).

The spelling of 21422444444 in words is "twenty-one billion, four hundred twenty-two million, four hundred forty-four thousand, four hundred forty-four".