21130232004 has 36 divisors (see below), whose sum is σ = 61042893184. Its totient is φ = 6037209072.

The previous prime is 21130231943. The next prime is 21130232027. The reversal of 21130232004 is 40023203112.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 41924812 + ... + 41925315.

Almost surely, 2^21130232004 is an apocalyptic number.

It is an amenable number.

21130232004 is an abundant number, since it is smaller than the sum of its proper divisors (39912661180).

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

21130232004 is a wasteful number, since it uses less digits than its factorization.

21130232004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83850144 (or 83850139 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21130232004 its reverse (40023203112), we get a palindrome (61153435116).

The spelling of 21130232004 in words is "twenty-one billion, one hundred thirty million, two hundred thirty-two thousand, four".