13531153421 has 2 divisors, whose sum is σ = 13531153422. Its totient is φ = 13531153420.

The previous prime is 13531153409. The next prime is 13531153439. The reversal of 13531153421 is 12435113531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11682583396 + 1848570025 = 108086^2 + 42995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13531153421 is a prime.

It is a super-2 number, since 2×13531153421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13531153121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765576710 + 6765576711.

It is an arithmetic number, because the mean of its divisors is an integer number (6765576711).

Almost surely, 2^13531153421 is an apocalyptic number.

It is an amenable number.

13531153421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531153421 is an equidigital number, since it uses as much as digits as its factorization.

13531153421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

Adding to 13531153421 its reverse (12435113531), we get a palindrome (25966266952).

The spelling of 13531153421 in words is "thirteen billion, five hundred thirty-one million, one hundred fifty-three thousand, four hundred twenty-one".