21312133230 has 16 divisors (see below), whose sum is σ = 51149119824. Its totient is φ = 5683235520.

The previous prime is 21312133217. The next prime is 21312133231. The reversal of 21312133230 is 3233121312.

It is a junction number, because it is equal to n+sod(n) for n = 21312133197 and 21312133206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312133231) 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 7 ways as a sum of consecutive naturals, for example, 355202191 + ... + 355202250.

It is an arithmetic number, because the mean of its divisors is an integer number (3196819989).

Almost surely, 2^21312133230 is an apocalyptic number.

21312133230 is an abundant number, since it is smaller than the sum of its proper divisors (29836986594).

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

21312133230 is a wasteful number, since it uses less digits than its factorization.

21312133230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710404451.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21312133230 its reverse (3233121312), we get a palindrome (24545254542).

The spelling of 21312133230 in words is "twenty-one billion, three hundred twelve million, one hundred thirty-three thousand, two hundred thirty".