21146554160393 has 2 divisors, whose sum is σ = 21146554160394. Its totient is φ = 21146554160392.

The previous prime is 21146554160227. The next prime is 21146554160401. The reversal of 21146554160393 is 39306145564112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20888446470544 + 258107689849 = 4570388^2 + 508043^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21146554160393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21146554160093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10573277080196 + 10573277080197.

It is an arithmetic number, because the mean of its divisors is an integer number (10573277080197).

Almost surely, 2^{21146554160393} is an apocalyptic number.

It is an amenable number.

21146554160393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21146554160393 is an equidigital number, since it uses as much as digits as its factorization.

21146554160393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 21146554160393 in words is "twenty-one trillion, one hundred forty-six billion, five hundred fifty-four million, one hundred sixty thousand, three hundred ninety-three".