21440022404 has 6 divisors (see below), whose sum is σ = 37520039214. Its totient is φ = 10720011200.

The previous prime is 21440022403. The next prime is 21440022419. The reversal of 21440022404 is 40422004412.

It can be written as a sum of positive squares in only one way, i.e., 20305680004 + 1134342400 = 142498^2 + 33680^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21440022404.

It is not an unprimeable number, because it can be changed into a prime (21440022403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2680002797 + ... + 2680002804.

It is an arithmetic number, because the mean of its divisors is an integer number (6253339869).

Almost surely, 2^21440022404 is an apocalyptic number.

It is an amenable number.

21440022404 is a deficient number, since it is larger than the sum of its proper divisors (16080016810).

21440022404 is a wasteful number, since it uses less digits than its factorization.

21440022404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360005605 (or 5360005603 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 21440022404 its reverse (40422004412), we get a palindrome (61862026816).

The spelling of 21440022404 in words is "twenty-one billion, four hundred forty million, twenty-two thousand, four hundred four".