21476643056441 has 2 divisors, whose sum is σ = 21476643056442. Its totient is φ = 21476643056440.

The previous prime is 21476643056437. The next prime is 21476643056503. The reversal of 21476643056441 is 14465034667412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19832103555625 + 1644539500816 = 4453325^2 + 1282396^2 .

It is a cyclic number.

It is not a de Polignac number, because 21476643056441 - 2² = 21476643056437 is a prime.

It is a super-2 number, since 2×21476643056441² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21476643656441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10738321528220 + 10738321528221.

It is an arithmetic number, because the mean of its divisors is an integer number (10738321528221).

Almost surely, 2^{21476643056441} is an apocalyptic number.

It is an amenable number.

21476643056441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21476643056441 is an equidigital number, since it uses as much as digits as its factorization.

21476643056441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 53.

The spelling of 21476643056441 in words is "twenty-one trillion, four hundred seventy-six billion, six hundred forty-three million, fifty-six thousand, four hundred forty-one".