21444400130 has 32 divisors (see below), whose sum is σ = 39016963440. Its totient is φ = 8485171200.

The previous prime is 21444400111. The next prime is 21444400193. The reversal of 21444400130 is 3100444412.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 20569009561 + 875390569 = 143419^2 + 29587^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21444400096 and 21444400105.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2643080 + ... + 2651180.

Almost surely, 2^21444400130 is an apocalyptic number.

21444400130 is a deficient number, since it is larger than the sum of its proper divisors (17572563310).

21444400130 is a wasteful number, since it uses less digits than its factorization.

21444400130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10934.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21444400130 its reverse (3100444412), we get a palindrome (24544844542).

The spelling of 21444400130 in words is "twenty-one billion, four hundred forty-four million, four hundred thousand, one hundred thirty".