21130223004 has 192 divisors, whose sum is σ = 63068544000. Its totient is φ = 6055188480.

The previous prime is 21130222999. The next prime is 21130223063. The reversal of 21130223004 is 40032203112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2427492 + ... + 2436180.

It is an arithmetic number, because the mean of its divisors is an integer number (328482000).

Almost surely, 2^21130223004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21130223004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31534272000).

21130223004 is an abundant number, since it is smaller than the sum of its proper divisors (41938320996).

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

21130223004 is a wasteful number, since it uses less digits than its factorization.

21130223004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8825 (or 8817 counting only the distinct ones).

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

Adding to 21130223004 its reverse (40032203112), we get a palindrome (61162426116).

The spelling of 21130223004 in words is "twenty-one billion, one hundred thirty million, two hundred twenty-three thousand, four".