13540022021 has 2 divisors, whose sum is σ = 13540022022. Its totient is φ = 13540022020.

The previous prime is 13540021991. The next prime is 13540022039. The reversal of 13540022021 is 12022004531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7244392996 + 6295629025 = 85114^2 + 79345^2 .

It is a cyclic number.

It is not a de Polignac number, because 13540022021 - 2¹⁴ = 13540005637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13540021984 and 13540022002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13540024021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6770011010 + 6770011011.

It is an arithmetic number, because the mean of its divisors is an integer number (6770011011).

Almost surely, 2^13540022021 is an apocalyptic number.

It is an amenable number.

13540022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13540022021 is an equidigital number, since it uses as much as digits as its factorization.

13540022021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 13540022021 its reverse (12022004531), we get a palindrome (25562026552).

The spelling of 13540022021 in words is "thirteen billion, five hundred forty million, twenty-two thousand, twenty-one".