21002297473 has 2 divisors, whose sum is σ = 21002297474. Its totient is φ = 21002297472.

The previous prime is 21002297453. The next prime is 21002297483. The reversal of 21002297473 is 37479220012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12506619889 + 8495677584 = 111833^2 + 92172^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002297473 - 2¹³ = 21002289281 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002297413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501148736 + 10501148737.

It is an arithmetic number, because the mean of its divisors is an integer number (10501148737).

Almost surely, 2^21002297473 is an apocalyptic number.

It is an amenable number.

21002297473 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002297473 is an equidigital number, since it uses as much as digits as its factorization.

21002297473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 37.

The spelling of 21002297473 in words is "twenty-one billion, two million, two hundred ninety-seven thousand, four hundred seventy-three".