1321222256244 has 72 divisors (see below), whose sum is σ = 3646968185952. Its totient is φ = 399975026880.

The previous prime is 1321222256243. The next prime is 1321222256257. The reversal of 1321222256244 is 4426522221231.

1321222256244 is a `hidden beast` number, since 1 + 3 + 2 + 1 + 2 + 2 + 2 + 25 + 624 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1321222256199 and 1321222256208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321222256243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1245654 + ... + 2047949.

It is an arithmetic number, because the mean of its divisors is an integer number (50652335916).

Almost surely, 2^{1321222256244} is an apocalyptic number.

It is an amenable number.

1321222256244 is an abundant number, since it is smaller than the sum of its proper divisors (2325745929708).

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

1321222256244 is a wasteful number, since it uses less digits than its factorization.

1321222256244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3294637 (or 3294632 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

Adding to 1321222256244 its reverse (4426522221231), we get a palindrome (5747744477475).

The spelling of 1321222256244 in words is "one trillion, three hundred twenty-one billion, two hundred twenty-two million, two hundred fifty-six thousand, two hundred forty-four".