1368310921 has 4 divisors (see below), whose sum is σ = 1371168000. Its totient is φ = 1365453844.

The previous prime is 1368310913. The next prime is 1368310981. The reversal of 1368310921 is 1290138631.

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: 1290138631 = 29 ⋅44487539.

It is a cyclic number.

It is not a de Polignac number, because 1368310921 - 2³ = 1368310913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1368310981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1427821 + ... + 1428778.

It is an arithmetic number, because the mean of its divisors is an integer number (342792000).

Almost surely, 2^1368310921 is an apocalyptic number.

It is an amenable number.

1368310921 is a deficient number, since it is larger than the sum of its proper divisors (2857079).

1368310921 is an equidigital number, since it uses as much as digits as its factorization.

1368310921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857078.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1368310921 is about 36990.6869495553. The cubic root of 1368310921 is about 1110.1839159041.

The spelling of 1368310921 in words is "one billion, three hundred sixty-eight million, three hundred ten thousand, nine hundred twenty-one".