21643073592977 has 2 divisors, whose sum is σ = 21643073592978. Its totient is φ = 21643073592976.

The previous prime is 21643073592841. The next prime is 21643073593157. The reversal of 21643073592977 is 77929537034612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21443049080896 + 200024512081 = 4630664^2 + 447241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21643073592977 is a prime.

It is not a weakly prime, because it can be changed into another prime (21643073492977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10821536796488 + 10821536796489.

It is an arithmetic number, because the mean of its divisors is an integer number (10821536796489).

Almost surely, 2^{21643073592977} is an apocalyptic number.

It is an amenable number.

21643073592977 is a deficient number, since it is larger than the sum of its proper divisors (1).

21643073592977 is an equidigital number, since it uses as much as digits as its factorization.

21643073592977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120022560, while the sum is 65.

The spelling of 21643073592977 in words is "twenty-one trillion, six hundred forty-three billion, seventy-three million, five hundred ninety-two thousand, nine hundred seventy-seven".