21130423044 has 12 divisors (see below), whose sum is σ = 49304320464. Its totient is φ = 7043474344.

The previous prime is 21130422979. The next prime is 21130423057. The reversal of 21130423044 is 44032403112.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 880434282 + ... + 880434305.

It is an arithmetic number, because the mean of its divisors is an integer number (4108693372).

Almost surely, 2^21130423044 is an apocalyptic number.

It is an amenable number.

21130423044 is an abundant number, since it is smaller than the sum of its proper divisors (28173897420).

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

21130423044 is a wasteful number, since it uses less digits than its factorization.

21130423044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760868594 (or 1760868592 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21130423044 its reverse (44032403112), we get a palindrome (65162826156).

The spelling of 21130423044 in words is "twenty-one billion, one hundred thirty million, four hundred twenty-three thousand, forty-four".