21312221230 has 16 divisors (see below), whose sum is σ = 38902309344. Its totient is φ = 8404819360.

The previous prime is 21312221221. The next prime is 21312221233. The reversal of 21312221230 is 3212221312.

It is a junction number, because it is equal to n+sod(n) for n = 21312221198 and 21312221207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312221233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15007897 + ... + 15009316.

It is an arithmetic number, because the mean of its divisors is an integer number (2431394334).

Almost surely, 2^21312221230 is an apocalyptic number.

21312221230 is a deficient number, since it is larger than the sum of its proper divisors (17590088114).

21312221230 is a wasteful number, since it uses less digits than its factorization.

21312221230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30017291.

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

Adding to 21312221230 its reverse (3212221312), we get a palindrome (24524442542).

The spelling of 21312221230 in words is "twenty-one billion, three hundred twelve million, two hundred twenty-one thousand, two hundred thirty".