1310450221 has 4 divisors (see below), whose sum is σ = 1311587932. Its totient is φ = 1309312512.

The previous prime is 1310450209. The next prime is 1310450233. The reversal of 1310450221 is 1220540131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1220540131 = 263 ⋅4640837.

It is an interprime number because it is at equal distance from previous prime (1310450209) and next prime (1310450233).

It can be written as a sum of positive squares in 2 ways, for example, as 799192900 + 511257321 = 28270^2 + 22611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1310450221 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 (1310450291) 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, 567126 + ... + 569431.

It is an arithmetic number, because the mean of its divisors is an integer number (327896983).

Almost surely, 2^1310450221 is an apocalyptic number.

It is an amenable number.

1310450221 is a deficient number, since it is larger than the sum of its proper divisors (1137711).

1310450221 is a wasteful number, since it uses less digits than its factorization.

1310450221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137710.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1310450221 is about 36200.1411737579. The cubic root of 1310450221 is about 1094.3095168017.

Adding to 1310450221 its reverse (1220540131), we get a palindrome (2530990352).

The spelling of 1310450221 in words is "one billion, three hundred ten million, four hundred fifty thousand, two hundred twenty-one".