21073580497 has 2 divisors, whose sum is σ = 21073580498. Its totient is φ = 21073580496.

The previous prime is 21073580449. The next prime is 21073580543. The reversal of 21073580497 is 79408537012.

It is an a-pointer prime, because the next prime (21073580543) can be obtained adding 21073580497 to its sum of digits (46).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17159952016 + 3913628481 = 130996^2 + 62559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21073580497 is a prime.

It is not a weakly prime, because it can be changed into another prime (21073520497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10536790248 + 10536790249.

It is an arithmetic number, because the mean of its divisors is an integer number (10536790249).

Almost surely, 2^21073580497 is an apocalyptic number.

It is an amenable number.

21073580497 is a deficient number, since it is larger than the sum of its proper divisors (1).

21073580497 is an equidigital number, since it uses as much as digits as its factorization.

21073580497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 21073580497 in words is "twenty-one billion, seventy-three million, five hundred eighty thousand, four hundred ninety-seven".