1440120321221 has 4 divisors (see below), whose sum is σ = 1444663287852. Its totient is φ = 1435577354592.

The previous prime is 1440120321197. The next prime is 1440120321229. The reversal of 1440120321221 is 1221230210441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 623104996900 + 817015324321 = 789370^2 + 903889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440120321221 - 2²⁶ = 1440053212357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440120321229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2271482840 + ... + 2271483473.

It is an arithmetic number, because the mean of its divisors is an integer number (361165821963).

Almost surely, 2^{1440120321221} is an apocalyptic number.

It is an amenable number.

1440120321221 is a deficient number, since it is larger than the sum of its proper divisors (4542966631).

1440120321221 is an equidigital number, since it uses as much as digits as its factorization.

1440120321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4542966630.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 1440120321221 its reverse (1221230210441), we get a palindrome (2661350531662).

The spelling of 1440120321221 in words is "one trillion, four hundred forty billion, one hundred twenty million, three hundred twenty-one thousand, two hundred twenty-one".