221312130312 has 192 divisors, whose sum is σ = 696958516800. Its totient is φ = 58044833280.

The previous prime is 221312130239. The next prime is 221312130341. The reversal of 221312130312 is 213031213122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2727139 + ... + 2807117.

It is an arithmetic number, because the mean of its divisors is an integer number (3629992275).

Almost surely, 2^221312130312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221312130312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348479258400).

221312130312 is an abundant number, since it is smaller than the sum of its proper divisors (475646386488).

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

221312130312 is a wasteful number, since it uses less digits than its factorization.

221312130312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80196 (or 80185 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 221312130312 its reverse (213031213122), we get a palindrome (434343343434).

The spelling of 221312130312 in words is "two hundred twenty-one billion, three hundred twelve million, one hundred thirty thousand, three hundred twelve".