13542131021 has 2 divisors, whose sum is σ = 13542131022. Its totient is φ = 13542131020.

The previous prime is 13542130991. The next prime is 13542131063. The reversal of 13542131021 is 12013124531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11115484900 + 2426646121 = 105430^2 + 49261^2 .

It is a cyclic number.

It is not a de Polignac number, because 13542131021 - 2¹⁸ = 13541868877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13542131221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6771065510 + 6771065511.

It is an arithmetic number, because the mean of its divisors is an integer number (6771065511).

Almost surely, 2^13542131021 is an apocalyptic number.

It is an amenable number.

13542131021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13542131021 is an equidigital number, since it uses as much as digits as its factorization.

13542131021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 13542131021 its reverse (12013124531), we get a palindrome (25555255552).

The spelling of 13542131021 in words is "thirteen billion, five hundred forty-two million, one hundred thirty-one thousand, twenty-one".