21422100044 has 24 divisors (see below), whose sum is σ = 39714258528. Its totient is φ = 10075815680.

The previous prime is 21422100043. The next prime is 21422100047. The reversal of 21422100044 is 44000122412.

It is a junction number, because it is equal to n+sod(n) for n = 21422099989 and 21422100025.

It is not an unprimeable number, because it can be changed into a prime (21422100043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54329 + ... + 213999.

It is an arithmetic number, because the mean of its divisors is an integer number (1654760772).

Almost surely, 2^21422100044 is an apocalyptic number.

It is an amenable number.

21422100044 is a deficient number, since it is larger than the sum of its proper divisors (18292158484).

21422100044 is a wasteful number, since it uses less digits than its factorization.

21422100044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161665 (or 161663 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21422100044 its reverse (44000122412), we get a palindrome (65422222456).

The spelling of 21422100044 in words is "twenty-one billion, four hundred twenty-two million, one hundred thousand, forty-four".