13523242421 has 16 divisors (see below), whose sum is σ = 14951193600. Its totient is φ = 12152004480.

The previous prime is 13523242417. The next prime is 13523242427. The reversal of 13523242421 is 12424232531.

It is a cyclic number.

It is not a de Polignac number, because 13523242421 - 2² = 13523242417 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 (13523242427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219380 + ... + 274178.

It is an arithmetic number, because the mean of its divisors is an integer number (934449600).

Almost surely, 2^13523242421 is an apocalyptic number.

It is an amenable number.

13523242421 is a deficient number, since it is larger than the sum of its proper divisors (1427951179).

13523242421 is a wasteful number, since it uses less digits than its factorization.

13523242421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55316.

The product of its digits is 11520, while the sum is 29.

Adding to 13523242421 its reverse (12424232531), we get a palindrome (25947474952).

The spelling of 13523242421 in words is "thirteen billion, five hundred twenty-three million, two hundred forty-two thousand, four hundred twenty-one".