10921512205 has 4 divisors (see below), whose sum is σ = 13105814652. Its totient is φ = 8737209760.

The previous prime is 10921512191. The next prime is 10921512241. The reversal of 10921512205 is 50221512901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3197563209 + 7723948996 = 56547^2 + 87886^2 .

It is a de Polignac number, because none of the positive numbers 2^k-10921512205 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1092151216 + ... + 1092151225.

It is an arithmetic number, because the mean of its divisors is an integer number (3276453663).

Almost surely, 2^10921512205 is an apocalyptic number.

It is an amenable number.

10921512205 is a deficient number, since it is larger than the sum of its proper divisors (2184302447).

10921512205 is an equidigital number, since it uses as much as digits as its factorization.

10921512205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2184302446.

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 10921512205 in words is "ten billion, nine hundred twenty-one million, five hundred twelve thousand, two hundred five".