1340112400421 has 4 divisors (see below), whose sum is σ = 1344339884652. Its totient is φ = 1335884916192.

The previous prime is 1340112400379. The next prime is 1340112400439. The reversal of 1340112400421 is 1240042110431.

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 80364312196 + 1259748088225 = 283486^2 + 1122385^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340112400421 - 2³⁰ = 1339038658597 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 (1340112400021) 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, 2113741640 + ... + 2113742273.

It is an arithmetic number, because the mean of its divisors is an integer number (336084971163).

Almost surely, 2^{1340112400421} is an apocalyptic number.

It is an amenable number.

1340112400421 is a deficient number, since it is larger than the sum of its proper divisors (4227484231).

1340112400421 is an equidigital number, since it uses as much as digits as its factorization.

1340112400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4227484230.

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

Adding to 1340112400421 its reverse (1240042110431), we get a palindrome (2580154510852).

The spelling of 1340112400421 in words is "one trillion, three hundred forty billion, one hundred twelve million, four hundred thousand, four hundred twenty-one".