21195873033985 has 12 divisors (see below), whose sum is σ = 27542093008572. Its totient is φ = 15652337009088.

The previous prime is 21195873033919. The next prime is 21195873033989. The reversal of 21195873033985 is 58933037859112.

It can be written as a sum of positive squares in 6 ways, for example, as 1370119411441 + 19825753622544 = 1170521^2 + 4452612^2 .

It is not a de Polignac number, because 21195873033985 - 2²⁷ = 21195738816257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21195873033989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12541935862 + ... + 12541937551.

It is an arithmetic number, because the mean of its divisors is an integer number (2295174417381).

Almost surely, 2^{21195873033985} is an apocalyptic number.

It is an amenable number.

21195873033985 is a deficient number, since it is larger than the sum of its proper divisors (6346219974587).

21195873033985 is a wasteful number, since it uses less digits than its factorization.

21195873033985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25083873444 (or 25083873431 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 64.

The spelling of 21195873033985 in words is "twenty-one trillion, one hundred ninety-five billion, eight hundred seventy-three million, thirty-three thousand, nine hundred eighty-five".