23133440343521 has 4 divisors (see below), whose sum is σ = 23697670595844. Its totient is φ = 22569210091200.

The previous prime is 23133440343487. The next prime is 23133440343547. The reversal of 23133440343521 is 12534304433132.

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 898961874496 + 22234478469025 = 948136^2 + 4715345^2 .

It is a cyclic number.

It is not a de Polignac number, because 23133440343521 - 2¹⁸ = 23133440081377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23133440343571) 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, 282115126100 + ... + 282115126181.

It is an arithmetic number, because the mean of its divisors is an integer number (5924417648961).

Almost surely, 2^{23133440343521} is an apocalyptic number.

It is an amenable number.

23133440343521 is a deficient number, since it is larger than the sum of its proper divisors (564230252323).

23133440343521 is an equidigital number, since it uses as much as digits as its factorization.

23133440343521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564230252322.

The product of its (nonzero) digits is 311040, while the sum is 38.

Adding to 23133440343521 its reverse (12534304433132), we get a palindrome (35667744776653).

The spelling of 23133440343521 in words is "twenty-three trillion, one hundred thirty-three billion, four hundred forty million, three hundred forty-three thousand, five hundred twenty-one".