13531142421 has 10 divisors (see below), whose sum is σ = 20213188182. Its totient is φ = 9020761560.

The previous prime is 13531142381. The next prime is 13531142447. The reversal of 13531142421 is 12424113531.

It can be written as a sum of positive squares in only one way, i.e., 7922780100 + 5608362321 = 89010^2 + 74889^2 .

It is not a de Polignac number, because 13531142421 - 2¹³ = 13531134229 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531142491) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 83525490 + ... + 83525651.

Almost surely, 2^13531142421 is an apocalyptic number.

It is an amenable number.

13531142421 is a deficient number, since it is larger than the sum of its proper divisors (6682045761).

13531142421 is an equidigital number, since it uses as much as digits as its factorization.

13531142421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167051153 (or 167051144 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

Adding to 13531142421 its reverse (12424113531), we get a palindrome (25955255952).

The spelling of 13531142421 in words is "thirteen billion, five hundred thirty-one million, one hundred forty-two thousand, four hundred twenty-one".