21253043365210 has 8 divisors (see below), whose sum is σ = 38255478057396. Its totient is φ = 8501217346080.

The previous prime is 21253043365207. The next prime is 21253043365247. The reversal of 21253043365210 is 1256334035212.

It can be written as a sum of positive squares in 2 ways, for example, as 21101078275281 + 151965089929 = 4593591^2 + 389827^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21253043365210.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1062652168251 + ... + 1062652168270.

Almost surely, 2^{21253043365210} is an apocalyptic number.

21253043365210 is a deficient number, since it is larger than the sum of its proper divisors (17002434692186).

21253043365210 is a wasteful number, since it uses less digits than its factorization.

21253043365210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125304336528.

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 21253043365210 in words is "twenty-one trillion, two hundred fifty-three billion, forty-three million, three hundred sixty-five thousand, two hundred ten".