1321000012224 has 168 divisors, whose sum is σ = 4010213963808. Its totient is φ = 414320148480.

The previous prime is 1321000012217. The next prime is 1321000012247. The reversal of 1321000012224 is 4222100001231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1321000012197 and 1321000012206.

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, 41276869 + ... + 41308859.

Almost surely, 2^{1321000012224} 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 1321000012224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2005106981904).

1321000012224 is an abundant number, since it is smaller than the sum of its proper divisors (2689213951584).

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

1321000012224 is a wasteful number, since it uses less digits than its factorization.

1321000012224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36243 (or 36230 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 1321000012224 its reverse (4222100001231), we get a palindrome (5543100013455).

The spelling of 1321000012224 in words is "one trillion, three hundred twenty-one billion, twelve thousand, two hundred twenty-four".