21231222312 has 32 divisors (see below), whose sum is σ = 53355962880. Its totient is φ = 7040019840.

The previous prime is 21231222301. The next prime is 21231222317. The reversal of 21231222312 is 21322213212.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21231222317) 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, 2311213 + ... + 2320380.

It is an arithmetic number, because the mean of its divisors is an integer number (1667373840).

Almost surely, 2^21231222312 is an apocalyptic number.

It is an amenable number.

21231222312 is an abundant number, since it is smaller than the sum of its proper divisors (32124740568).

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

21231222312 is a wasteful number, since it uses less digits than its factorization.

21231222312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4631793 (or 4631789 counting only the distinct ones).

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

Adding to 21231222312 its reverse (21322213212), we get a palindrome (42553435524).

The spelling of 21231222312 in words is "twenty-one billion, two hundred thirty-one million, two hundred twenty-two thousand, three hundred twelve".