21444432130 has 32 divisors (see below), whose sum is σ = 43136126208. Its totient is φ = 7607779200.

The previous prime is 21444432127. The next prime is 21444432143. The reversal of 21444432130 is 3123444412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2372922 + ... + 2381941.

It is an arithmetic number, because the mean of its divisors is an integer number (1348003944).

Almost surely, 2^21444432130 is an apocalyptic number.

21444432130 is an abundant number, since it is smaller than the sum of its proper divisors (21691694078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21444432130 is a wasteful number, since it uses less digits than its factorization.

21444432130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4754922.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21444432130 its reverse (3123444412), we get a palindrome (24567876542).

The spelling of 21444432130 in words is "twenty-one billion, four hundred forty-four million, four hundred thirty-two thousand, one hundred thirty".