1221223341440 has 64 divisors (see below), whose sum is σ = 2934614223360. Its totient is φ = 485958254592.

The previous prime is 1221223341439. The next prime is 1221223341451. The reversal of 1221223341440 is 441433221221.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4819904 + ... + 5066943.

It is an arithmetic number, because the mean of its divisors is an integer number (45853347240).

Almost surely, 2^{1221223341440} is an apocalyptic number.

1221223341440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221223341440 is an abundant number, since it is smaller than the sum of its proper divisors (1713390881920).

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

1221223341440 is an equidigital number, since it uses as much as digits as its factorization.

1221223341440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9887059 (or 9887047 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 1221223341440 its reverse (441433221221), we get a palindrome (1662656562661).

The spelling of 1221223341440 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-three million, three hundred forty-one thousand, four hundred forty".