13531012021 has 2 divisors, whose sum is σ = 13531012022. Its totient is φ = 13531012020.

The previous prime is 13531011983. The next prime is 13531012039. The reversal of 13531012021 is 12021013531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12965238225 + 565773796 = 113865^2 + 23786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13531012021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13531012021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13531012321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765506010 + 6765506011.

It is an arithmetic number, because the mean of its divisors is an integer number (6765506011).

Almost surely, 2^13531012021 is an apocalyptic number.

It is an amenable number.

13531012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531012021 is an equidigital number, since it uses as much as digits as its factorization.

13531012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 13531012021 its reverse (12021013531), we get a palindrome (25552025552).

The spelling of 13531012021 in words is "thirteen billion, five hundred thirty-one million, twelve thousand, twenty-one".