21923260430985 has 20 divisors (see below), whose sum is σ = 39299474254788. Its totient is φ = 11692405562976.

The previous prime is 21923260430957. The next prime is 21923260431029. The reversal of 21923260430985 is 58903406232912.

21923260430985 is a `hidden beast` number, since 2 + 1 + 9 + 2 + 326 + 0 + 4 + 309 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15838020049401 + 6085240381584 = 3979701^2 + 2466828^2 .

It is not a de Polignac number, because 21923260430985 - 2¹² = 21923260426889 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27065753214 + ... + 27065754023.

Almost surely, 2^{21923260430985} is an apocalyptic number.

It is an amenable number.

21923260430985 is a deficient number, since it is larger than the sum of its proper divisors (17376213823803).

21923260430985 is an equidigital number, since it uses as much as digits as its factorization.

21923260430985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54131507254 (or 54131507245 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 21923260430985 in words is "twenty-one trillion, nine hundred twenty-three billion, two hundred sixty million, four hundred thirty thousand, nine hundred eighty-five".