1340420244021 has 16 divisors (see below), whose sum is σ = 2018361997120. Its totient is φ = 878964093360.

The previous prime is 1340420244001. The next prime is 1340420244047. The reversal of 1340420244021 is 1204420240431.

1340420244021 is a `hidden beast` number, since 13 + 4 + 0 + 4 + 202 + 440 + 2 + 1 = 666.

It is not a de Polignac number, because 1340420244021 - 2¹¹ = 1340420241973 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340420244001) 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, 406926175 + ... + 406929468.

It is an arithmetic number, because the mean of its divisors is an integer number (126147624820).

Almost surely, 2^{1340420244021} is an apocalyptic number.

It is an amenable number.

1340420244021 is a deficient number, since it is larger than the sum of its proper divisors (677941753099).

1340420244021 is an equidigital number, since it uses as much as digits as its factorization.

1340420244021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813855713 (or 813855707 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 1340420244021 its reverse (1204420240431), we get a palindrome (2544840484452).

The spelling of 1340420244021 in words is "one trillion, three hundred forty billion, four hundred twenty million, two hundred forty-four thousand, twenty-one".