13533412021 has 2 divisors, whose sum is σ = 13533412022. Its totient is φ = 13533412020.

The previous prime is 13533412007. The next prime is 13533412033. The reversal of 13533412021 is 12021433531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9223489521 + 4309922500 = 96039^2 + 65650^2 .

It is an emirp because it is prime and its reverse (12021433531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13533412021 - 2⁹ = 13533411509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13533412051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6766706010 + 6766706011.

It is an arithmetic number, because the mean of its divisors is an integer number (6766706011).

Almost surely, 2^13533412021 is an apocalyptic number.

It is an amenable number.

13533412021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13533412021 is an equidigital number, since it uses as much as digits as its factorization.

13533412021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 13533412021 its reverse (12021433531), we get a palindrome (25554845552).

The spelling of 13533412021 in words is "thirteen billion, five hundred thirty-three million, four hundred twelve thousand, twenty-one".