23404202408521 has 9 divisors (see below), whose sum is σ = 25725338826733. Its totient is φ = 21276499266220.

The previous prime is 23404202408519. The next prime is 23404202408557. The reversal of 23404202408521 is 12580420240432.

The square root of 23404202408521 is 4837789.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 23404202408521 - 2¹ = 23404202408519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23404202402521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 52995780 + ... + 53435578.

Almost surely, 2^{23404202408521} is an apocalyptic number.

23404202408521 is the 4837789-th square number.

23404202408521 is the 2418895-th centered octagonal number.

It is an amenable number.

23404202408521 is a deficient number, since it is larger than the sum of its proper divisors (2321136418212).

23404202408521 is an frugal number, since it uses more digits than its factorization.

23404202408521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879620 (or 439810 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 37.

Adding to 23404202408521 its reverse (12580420240432), we get a palindrome (35984622648953).

The spelling of 23404202408521 in words is "twenty-three trillion, four hundred four billion, two hundred two million, four hundred eight thousand, five hundred twenty-one".