1318423021 has 4 divisors (see below), whose sum is σ = 1335112000. Its totient is φ = 1301734044.

The previous prime is 1318423013. The next prime is 1318423031. The reversal of 1318423021 is 1203248131.

It is a happy number.

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 1318423021 - 2³ = 1318423013 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 (1318423031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8344371 + ... + 8344528.

It is an arithmetic number, because the mean of its divisors is an integer number (333778000).

Almost surely, 2^1318423021 is an apocalyptic number.

It is an amenable number.

1318423021 is a deficient number, since it is larger than the sum of its proper divisors (16688979).

1318423021 is an equidigital number, since it uses as much as digits as its factorization.

1318423021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16688978.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1318423021 is about 36310.0953041988. The cubic root of 1318423021 is about 1096.5242967757.

The spelling of 1318423021 in words is "one billion, three hundred eighteen million, four hundred twenty-three thousand, twenty-one".