1321240105 has 8 divisors (see below), whose sum is σ = 1587293064. Its totient is φ = 1055788800.

The previous prime is 1321240091. The next prime is 1321240111. The reversal of 1321240105 is 5010421231.

It can be written as a sum of positive squares in 4 ways, for example, as 238764304 + 1082475801 = 15452^2 + 32901^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321240105 - 2¹⁵ = 1321207337 is a prime.

It is a super-2 number, since 2×1321240105² = 3491350830120822050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145566 + ... + 154375.

It is an arithmetic number, because the mean of its divisors is an integer number (198411633).

Almost surely, 2^1321240105 is an apocalyptic number.

It is an amenable number.

1321240105 is a deficient number, since it is larger than the sum of its proper divisors (266052959).

1321240105 is an equidigital number, since it uses as much as digits as its factorization.

1321240105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300827.

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

The square root of 1321240105 is about 36348.8666260724. The cubic root of 1321240105 is about 1097.3047249877.

Adding to 1321240105 its reverse (5010421231), we get a palindrome (6331661336).

The spelling of 1321240105 in words is "one billion, three hundred twenty-one million, two hundred forty thousand, one hundred five".