1440108747821 has 4 divisors (see below), whose sum is σ = 1440146870652. Its totient is φ = 1440070624992.

The previous prime is 1440108747817. The next prime is 1440108747823. The reversal of 1440108747821 is 1287478010441.

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 11639173225 + 1428469574596 = 107885^2 + 1195186^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440108747821 - 2² = 1440108747817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440108747823) 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, 19004696 + ... + 19080321.

It is an arithmetic number, because the mean of its divisors is an integer number (360036717663).

Almost surely, 2^{1440108747821} is an apocalyptic number.

It is an amenable number.

1440108747821 is a deficient number, since it is larger than the sum of its proper divisors (38122831).

1440108747821 is an equidigital number, since it uses as much as digits as its factorization.

1440108747821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38122830.

The product of its (nonzero) digits is 401408, while the sum is 47.

The spelling of 1440108747821 in words is "one trillion, four hundred forty billion, one hundred eight million, seven hundred forty-seven thousand, eight hundred twenty-one".