21130223124 has 12 divisors (see below), whose sum is σ = 49303853984. Its totient is φ = 7043407704.

The previous prime is 21130223111. The next prime is 21130223129. The reversal of 21130223124 is 42132203112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21130223124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130223129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880425952 + ... + 880425975.

Almost surely, 2^21130223124 is an apocalyptic number.

It is an amenable number.

21130223124 is an abundant number, since it is smaller than the sum of its proper divisors (28173630860).

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

21130223124 is a wasteful number, since it uses less digits than its factorization.

21130223124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760851934 (or 1760851932 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21130223124 its reverse (42132203112), we get a palindrome (63262426236).

The spelling of 21130223124 in words is "twenty-one billion, one hundred thirty million, two hundred twenty-three thousand, one hundred twenty-four".