1221333022320 has 160 divisors (see below), whose sum is σ = 4023642470400. Its totient is φ = 305399255040.

The previous prime is 1221333022313. The next prime is 1221333022363. The reversal of 1221333022320 is 232203331221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 553381 + ... + 1657979.

It is an arithmetic number, because the mean of its divisors is an integer number (25147765440).

Almost surely, 2^{1221333022320} is an apocalyptic number.

1221333022320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221333022320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2011821235200).

1221333022320 is an abundant number, since it is smaller than the sum of its proper divisors (2802309448080).

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

1221333022320 is a wasteful number, since it uses less digits than its factorization.

1221333022320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104903 (or 1104897 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 1221333022320 its reverse (232203331221), we get a palindrome (1453536353541).

The spelling of 1221333022320 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-three million, twenty-two thousand, three hundred twenty".