13253523021 has 24 divisors (see below), whose sum is σ = 20076114240. Its totient is φ = 8736390432.

The previous prime is 13253523011. The next prime is 13253523029. The reversal of 13253523021 is 12032535231.

It is a happy number.

13253523021 is a `hidden beast` number, since 1 + 3 + 2 + 5 + 352 + 302 + 1 = 666.

It is not a de Polignac number, because 13253523021 - 2⁹ = 13253522509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13253523029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284785 + ... + 328038.

It is an arithmetic number, because the mean of its divisors is an integer number (836504760).

Almost surely, 2^13253523021 is an apocalyptic number.

It is an amenable number.

13253523021 is a deficient number, since it is larger than the sum of its proper divisors (6822591219).

13253523021 is an frugal number, since it uses more digits than its factorization.

13253523021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612927 (or 612915 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The spelling of 13253523021 in words is "thirteen billion, two hundred fifty-three million, five hundred twenty-three thousand, twenty-one".