13235435021 has 4 divisors (see below), whose sum is σ = 13235684700. Its totient is φ = 13235185344.

The previous prime is 13235434999. The next prime is 13235435039. The reversal of 13235435021 is 12053453231.

It is a happy number.

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 2680132900 + 10555302121 = 51770^2 + 102739^2 .

It is a cyclic number.

It is not a de Polignac number, because 13235435021 - 2²² = 13231240717 is a prime.

It is a super-2 number, since 2×13235435021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13235435071) 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, 10286 + ... + 163023.

It is an arithmetic number, because the mean of its divisors is an integer number (3308921175).

Almost surely, 2^13235435021 is an apocalyptic number.

It is an amenable number.

13235435021 is a deficient number, since it is larger than the sum of its proper divisors (249679).

13235435021 is an equidigital number, since it uses as much as digits as its factorization.

13235435021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249678.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 13235435021 its reverse (12053453231), we get a palindrome (25288888252).

The spelling of 13235435021 in words is "thirteen billion, two hundred thirty-five million, four hundred thirty-five thousand, twenty-one".