21422240444 has 96 divisors (see below), whose sum is σ = 42248236800. Its totient is φ = 9422645760.

The previous prime is 21422240431. The next prime is 21422240449. The reversal of 21422240444 is 44404222412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422240449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52376912 + ... + 52377320.

It is an arithmetic number, because the mean of its divisors is an integer number (440085800).

Almost surely, 2^21422240444 is an apocalyptic number.

It is an amenable number.

21422240444 is a deficient number, since it is larger than the sum of its proper divisors (20825996356).

21422240444 is a wasteful number, since it uses less digits than its factorization.

21422240444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 29.

Adding to 21422240444 its reverse (44404222412), we get a palindrome (65826462856).

The spelling of 21422240444 in words is "twenty-one billion, four hundred twenty-two million, two hundred forty thousand, four hundred forty-four".