21576472442773 has 2 divisors, whose sum is σ = 21576472442774. Its totient is φ = 21576472442772.

The previous prime is 21576472442771. The next prime is 21576472442807. The reversal of 21576472442773 is 37724427467512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19928787003889 + 1647685438884 = 4464167^2 + 1283622^2 .

It is a cyclic number.

It is not a de Polignac number, because 21576472442773 - 2¹ = 21576472442771 is a prime.

Together with 21576472442771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21576472442771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10788236221386 + 10788236221387.

It is an arithmetic number, because the mean of its divisors is an integer number (10788236221387).

Almost surely, 2^{21576472442773} is an apocalyptic number.

It is an amenable number.

21576472442773 is a deficient number, since it is larger than the sum of its proper divisors (1).

21576472442773 is an equidigital number, since it uses as much as digits as its factorization.

21576472442773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110638080, while the sum is 61.

The spelling of 21576472442773 in words is "twenty-one trillion, five hundred seventy-six billion, four hundred seventy-two million, four hundred forty-two thousand, seven hundred seventy-three".