21422124244 has 6 divisors (see below), whose sum is σ = 37488717434. Its totient is φ = 10711062120.

The previous prime is 21422124221. The next prime is 21422124253. The reversal of 21422124244 is 44242122412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20796524100 + 625600144 = 144210^2 + 25012^2 .

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 polite number, since it can be written as a sum of consecutive naturals, namely, 2677765527 + ... + 2677765534.

Almost surely, 2^21422124244 is an apocalyptic number.

It is an amenable number.

21422124244 is a deficient number, since it is larger than the sum of its proper divisors (16066593190).

21422124244 is a wasteful number, since it uses less digits than its factorization.

21422124244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5355531065 (or 5355531063 counting only the distinct ones).

The product of its digits is 8192, while the sum is 28.

Adding to 21422124244 its reverse (44242122412), we get a palindrome (65664246656).

The spelling of 21422124244 in words is "twenty-one billion, four hundred twenty-two million, one hundred twenty-four thousand, two hundred forty-four".