21650473676497 has 2 divisors, whose sum is σ = 21650473676498. Its totient is φ = 21650473676496.

The previous prime is 21650473676417. The next prime is 21650473676509. The reversal of 21650473676497 is 79467637405612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18012817710801 + 3637655965696 = 4244151^2 + 1907264^2 .

It is a cyclic number.

It is not a de Polignac number, because 21650473676497 - 2⁴³ = 12854380654289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21650473676407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10825236838248 + 10825236838249.

It is an arithmetic number, because the mean of its divisors is an integer number (10825236838249).

Almost surely, 2^{21650473676497} is an apocalyptic number.

It is an amenable number.

21650473676497 is a deficient number, since it is larger than the sum of its proper divisors (1).

21650473676497 is an equidigital number, since it uses as much as digits as its factorization.

21650473676497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320060160, while the sum is 67.

The spelling of 21650473676497 in words is "twenty-one trillion, six hundred fifty billion, four hundred seventy-three million, six hundred seventy-six thousand, four hundred ninety-seven".