21303113444 has 12 divisors (see below), whose sum is σ = 37425510444. Its totient is φ = 10610110464.

The previous prime is 21303113441. The next prime is 21303113459. The reversal of 21303113444 is 44431130312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20252705344 + 1050408100 = 142312^2 + 32410^2 .

It is a super-2 number, since 2×21303113444² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21303113441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10360409 + ... + 10362464.

It is an arithmetic number, because the mean of its divisors is an integer number (3118792537).

Almost surely, 2^21303113444 is an apocalyptic number.

It is an amenable number.

21303113444 is a deficient number, since it is larger than the sum of its proper divisors (16122397000).

21303113444 is a wasteful number, since it uses less digits than its factorization.

21303113444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20723134 (or 20723132 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21303113444 its reverse (44431130312), we get a palindrome (65734243756).

The spelling of 21303113444 in words is "twenty-one billion, three hundred three million, one hundred thirteen thousand, four hundred forty-four".