23540430401221 has 4 divisors (see below), whose sum is σ = 23712258360492. Its totient is φ = 23368602441952.

The previous prime is 23540430401177. The next prime is 23540430401273. The reversal of 23540430401221 is 12210403404532.

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 15583032576225 + 7957397824996 = 3947535^2 + 2820886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23540430401221 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 (23540430401281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85913979430 + ... + 85913979703.

It is an arithmetic number, because the mean of its divisors is an integer number (5928064590123).

Almost surely, 2^{23540430401221} is an apocalyptic number.

It is an amenable number.

23540430401221 is a deficient number, since it is larger than the sum of its proper divisors (171827959271).

23540430401221 is a wasteful number, since it uses less digits than its factorization.

23540430401221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171827959270.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 23540430401221 its reverse (12210403404532), we get a palindrome (35750833805753).

The spelling of 23540430401221 in words is "twenty-three trillion, five hundred forty billion, four hundred thirty million, four hundred one thousand, two hundred twenty-one".