21546134403071 has 2 divisors, whose sum is σ = 21546134403072. Its totient is φ = 21546134403070.

The previous prime is 21546134403023. The next prime is 21546134403077. The reversal of 21546134403071 is 17030443164512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21546134403071 - 2⁶ = 21546134403007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21546134403077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10773067201535 + 10773067201536.

It is an arithmetic number, because the mean of its divisors is an integer number (10773067201536).

Almost surely, 2^{21546134403071} is an apocalyptic number.

21546134403071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21546134403071 is an equidigital number, since it uses as much as digits as its factorization.

21546134403071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 41.

Adding to 21546134403071 its reverse (17030443164512), we get a palindrome (38576577567583).

The spelling of 21546134403071 in words is "twenty-one trillion, five hundred forty-six billion, one hundred thirty-four million, four hundred three thousand, seventy-one".