1244120221440 has 144 divisors (see below), whose sum is σ = 4414898964000. Its totient is φ = 331765383168.

The previous prime is 1244120221427. The next prime is 1244120221447. The reversal of 1244120221440 is 441220214421.

1244120221440 is a `hidden beast` number, since 1 + 2 + 441 + 2 + 0 + 2 + 214 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244120221447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17964865 + ... + 18033984.

Almost surely, 2^{1244120221440} is an apocalyptic number.

1244120221440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1244120221440 is an abundant number, since it is smaller than the sum of its proper divisors (3170778742560).

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

1244120221440 is an equidigital number, since it uses as much as digits as its factorization.

1244120221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35998879 (or 35998859 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 1244120221440 its reverse (441220214421), we get a palindrome (1685340435861).

The spelling of 1244120221440 in words is "one trillion, two hundred forty-four billion, one hundred twenty million, two hundred twenty-one thousand, four hundred forty".