1311340421 has 4 divisors (see below), whose sum is σ = 1346782092. Its totient is φ = 1275898752.

The previous prime is 1311340417. The next prime is 1311340477. The reversal of 1311340421 is 1240431131.

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 1231237921 + 80102500 = 35089^2 + 8950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311340421 - 2² = 1311340417 is a prime.

It is a super-2 number, since 2×1311340421² = 3439227399496914482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311340393 and 1311340402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311340411) 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, 17720780 + ... + 17720853.

It is an arithmetic number, because the mean of its divisors is an integer number (336695523).

Almost surely, 2^1311340421 is an apocalyptic number.

It is an amenable number.

1311340421 is a deficient number, since it is larger than the sum of its proper divisors (35441671).

1311340421 is an equidigital number, since it uses as much as digits as its factorization.

1311340421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35441670.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1311340421 is about 36212.4346185119. The cubic root of 1311340421 is about 1094.5572519733.

Adding to 1311340421 its reverse (1240431131), we get a palindrome (2551771552).

The spelling of 1311340421 in words is "one billion, three hundred eleven million, three hundred forty thousand, four hundred twenty-one".