20413154463521 has 2 divisors, whose sum is σ = 20413154463522. Its totient is φ = 20413154463520.

The previous prime is 20413154463497. The next prime is 20413154463577. The reversal of 20413154463521 is 12536445131402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12727313111296 + 7685841352225 = 3567536^2 + 2772335^2 .

It is a cyclic number.

It is not a de Polignac number, because 20413154463521 - 2¹⁴ = 20413154447137 is a prime.

It is not a weakly prime, because it can be changed into another prime (20413124463521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206577231760 + 10206577231761.

It is an arithmetic number, because the mean of its divisors is an integer number (10206577231761).

Almost surely, 2^{20413154463521} is an apocalyptic number.

It is an amenable number.

20413154463521 is a deficient number, since it is larger than the sum of its proper divisors (1).

20413154463521 is an equidigital number, since it uses as much as digits as its factorization.

20413154463521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 41.

Adding to 20413154463521 its reverse (12536445131402), we get a palindrome (32949599594923).

The spelling of 20413154463521 in words is "twenty trillion, four hundred thirteen billion, one hundred fifty-four million, four hundred sixty-three thousand, five hundred twenty-one".