1311400221 has 4 divisors (see below), whose sum is σ = 1748533632. Its totient is φ = 874266812.

The previous prime is 1311400219. The next prime is 1311400267. The reversal of 1311400221 is 1220041131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1220041131 = 3 ⋅406680377.

It is a cyclic number.

It is not a de Polignac number, because 1311400221 - 2¹ = 1311400219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1311400221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311400291) 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, 218566701 + ... + 218566706.

It is an arithmetic number, because the mean of its divisors is an integer number (437133408).

Almost surely, 2^1311400221 is an apocalyptic number.

It is an amenable number.

1311400221 is a deficient number, since it is larger than the sum of its proper divisors (437133411).

1311400221 is an equidigital number, since it uses as much as digits as its factorization.

1311400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437133410.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1311400221 is about 36213.2602923294. The cubic root of 1311400221 is about 1094.5738897911.

Adding to 1311400221 its reverse (1220041131), we get a palindrome (2531441352).

The spelling of 1311400221 in words is "one billion, three hundred eleven million, four hundred thousand, two hundred twenty-one".