21823603973 has 2 divisors, whose sum is σ = 21823603974. Its totient is φ = 21823603972.

The previous prime is 21823603909. The next prime is 21823603993. The reversal of 21823603973 is 37930632812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13059461284 + 8764142689 = 114278^2 + 93617^2 .

It is a cyclic number.

It is not a de Polignac number, because 21823603973 - 2⁶ = 21823603909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21823603903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10911801986 + 10911801987.

It is an arithmetic number, because the mean of its divisors is an integer number (10911801987).

Almost surely, 2^21823603973 is an apocalyptic number.

It is an amenable number.

21823603973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21823603973 is an equidigital number, since it uses as much as digits as its factorization.

21823603973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 21823603973 in words is "twenty-one billion, eight hundred twenty-three million, six hundred three thousand, nine hundred seventy-three".