1310161262221 has 4 divisors (see below), whose sum is σ = 1497327156832. Its totient is φ = 1122995367612.

The previous prime is 1310161262183. The next prime is 1310161262273. The reversal of 1310161262221 is 1222621610131.

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.

It is a cyclic number.

It is not a de Polignac number, because 1310161262221 - 2⁹ = 1310161261709 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1310161262221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310161262321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93582947295 + ... + 93582947308.

It is an arithmetic number, because the mean of its divisors is an integer number (374331789208).

Almost surely, 2^{1310161262221} is an apocalyptic number.

It is an amenable number.

1310161262221 is a deficient number, since it is larger than the sum of its proper divisors (187165894611).

1310161262221 is an equidigital number, since it uses as much as digits as its factorization.

1310161262221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187165894610.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 1310161262221 its reverse (1222621610131), we get a palindrome (2532782872352).

The spelling of 1310161262221 in words is "one trillion, three hundred ten billion, one hundred sixty-one million, two hundred sixty-two thousand, two hundred twenty-one".