21312122230 has 48 divisors (see below), whose sum is σ = 46565215200. Its totient is φ = 6989313408.

The previous prime is 21312122149. The next prime is 21312122269. The reversal of 21312122230 is 3222121312.

It is a junction number, because it is equal to n+sod(n) for n = 21312122198 and 21312122207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 934255 + ... + 956794.

It is an arithmetic number, because the mean of its divisors is an integer number (970108650).

Almost surely, 2^21312122230 is an apocalyptic number.

21312122230 is an abundant number, since it is smaller than the sum of its proper divisors (25253092970).

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

21312122230 is a wasteful number, since it uses less digits than its factorization.

21312122230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891093 (or 1891086 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21312122230 its reverse (3222121312), we get a palindrome (24534243542).

The spelling of 21312122230 in words is "twenty-one billion, three hundred twelve million, one hundred twenty-two thousand, two hundred thirty".