21244003442 has 16 divisors (see below), whose sum is σ = 31918729752. Its totient is φ = 10604442240.

The previous prime is 21244003433. The next prime is 21244003453. The reversal of 21244003442 is 24430044212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20637908281 + 606095161 = 143659^2 + 24619^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5557892 + ... + 5561712.

Almost surely, 2^21244003442 is an apocalyptic number.

21244003442 is a deficient number, since it is larger than the sum of its proper divisors (10674726310).

21244003442 is a wasteful number, since it uses less digits than its factorization.

21244003442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7693.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21244003442 its reverse (24430044212), we get a palindrome (45674047654).

The spelling of 21244003442 in words is "twenty-one billion, two hundred forty-four million, three thousand, four hundred forty-two".