21404024422 has 48 divisors (see below), whose sum is σ = 35976199680. Its totient is φ = 9470260800.

The previous prime is 21404024413. The next prime is 21404024423. The reversal of 21404024422 is 22442040412.

It is a super-2 number, since 2×21404024422² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404024423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9260647 + ... + 9262957.

It is an arithmetic number, because the mean of its divisors is an integer number (749504160).

Almost surely, 2^21404024422 is an apocalyptic number.

21404024422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21404024422 is a deficient number, since it is larger than the sum of its proper divisors (14572175258).

21404024422 is a wasteful number, since it uses less digits than its factorization.

21404024422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549 (or 2476 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 21404024422 its reverse (22442040412), we get a palindrome (43846064834).

The spelling of 21404024422 in words is "twenty-one billion, four hundred four million, twenty-four thousand, four hundred twenty-two".