1326563421 has 4 divisors (see below), whose sum is σ = 1768751232. Its totient is φ = 884375612.

The previous prime is 1326563419. The next prime is 1326563429. The reversal of 1326563421 is 1243656231.

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 1326563421 - 2¹ = 1326563419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326563429) 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, 221093901 + ... + 221093906.

It is an arithmetic number, because the mean of its divisors is an integer number (442187808).

Almost surely, 2^1326563421 is an apocalyptic number.

It is an amenable number.

1326563421 is a deficient number, since it is larger than the sum of its proper divisors (442187811).

1326563421 is an equidigital number, since it uses as much as digits as its factorization.

1326563421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442187810.

The product of its digits is 25920, while the sum is 33.

The square root of 1326563421 is about 36422.0183542867. The cubic root of 1326563421 is about 1098.7764414370.

The spelling of 1326563421 in words is "one billion, three hundred twenty-six million, five hundred sixty-three thousand, four hundred twenty-one".