1310210221 has 4 divisors (see below), whose sum is σ = 1311649344. Its totient is φ = 1308771100.

The previous prime is 1310210173. The next prime is 1310210243. The reversal of 1310210221 is 1220120131.

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: 1220120131 = 19 ⋅64216849.

It is a cyclic number.

It is not a de Polignac number, because 1310210221 - 2⁷ = 1310210093 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 (1310210821) 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, 718195 + ... + 720016.

It is an arithmetic number, because the mean of its divisors is an integer number (327912336).

Almost surely, 2^1310210221 is an apocalyptic number.

It is an amenable number.

1310210221 is a deficient number, since it is larger than the sum of its proper divisors (1439123).

1310210221 is an equidigital number, since it uses as much as digits as its factorization.

1310210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439122.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1310210221 is about 36196.8261177689. The cubic root of 1310210221 is about 1094.2427076205.

Adding to 1310210221 its reverse (1220120131), we get a palindrome (2530330352).

The spelling of 1310210221 in words is "one billion, three hundred ten million, two hundred ten thousand, two hundred twenty-one".