312221213000 has 128 divisors (see below), whose sum is σ = 734190912000. Its totient is φ = 124276032000.

The previous prime is 312221212973. The next prime is 312221213077. The reversal of 312221213000 is 312122213.

It is a self number, because there is not a number n which added to its sum of digits gives 312221213000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297636476 + ... + 297637524.

It is an arithmetic number, because the mean of its divisors is an integer number (5735866500).

Almost surely, 2^312221213000 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 312221213000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367095456000).

312221213000 is an abundant number, since it is smaller than the sum of its proper divisors (421969699000).

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

312221213000 is a wasteful number, since it uses less digits than its factorization.

312221213000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248 (or 2234 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 312221213000 its reverse (312122213), we get a palindrome (312533335213).

The spelling of 312221213000 in words is "three hundred twelve billion, two hundred twenty-one million, two hundred thirteen thousand".