1323538810421 has 4 divisors (see below), whose sum is σ = 1338410033100. Its totient is φ = 1308667587744.

The previous prime is 1323538810411. The next prime is 1323538810553. The reversal of 1323538810421 is 1240188353231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 297144912100 + 1026393898321 = 545110^2 + 1013111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1323538810421 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 (1323538810411) 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, 7435611206 + ... + 7435611383.

It is an arithmetic number, because the mean of its divisors is an integer number (334602508275).

Almost surely, 2^{1323538810421} is an apocalyptic number.

It is an amenable number.

1323538810421 is a deficient number, since it is larger than the sum of its proper divisors (14871222679).

1323538810421 is an equidigital number, since it uses as much as digits as its factorization.

1323538810421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14871222678.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 1323538810421 in words is "one trillion, three hundred twenty-three billion, five hundred thirty-eight million, eight hundred ten thousand, four hundred twenty-one".