1340440313421 has 32 divisors (see below), whose sum is σ = 2084124349440. Its totient is φ = 758113980800.

The previous prime is 1340440313419. The next prime is 1340440313431. The reversal of 1340440313421 is 1243130440431.

It is not a de Polignac number, because 1340440313421 - 2¹ = 1340440313419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340440313431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21506211 + ... + 21568448.

It is an arithmetic number, because the mean of its divisors is an integer number (65128885920).

Almost surely, 2^{1340440313421} is an apocalyptic number.

1340440313421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1340440313421 is a deficient number, since it is larger than the sum of its proper divisors (743684036019).

1340440313421 is a wasteful number, since it uses less digits than its factorization.

1340440313421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43074737.

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 1340440313421 its reverse (1243130440431), we get a palindrome (2583570753852).

The spelling of 1340440313421 in words is "one trillion, three hundred forty billion, four hundred forty million, three hundred thirteen thousand, four hundred twenty-one".