10665253112221 has 4 divisors (see below), whose sum is σ = 10665357285244. Its totient is φ = 10665148939200.

The previous prime is 10665253112203. The next prime is 10665253112243. The reversal of 10665253112221 is 12221135256601.

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 5972011812900 + 4693241299321 = 2443770^2 + 2166389^2 .

It is a cyclic number.

It is not a de Polignac number, because 10665253112221 - 2¹¹ = 10665253110173 is a prime.

It is a super-2 number, since 2×10665253112221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10665253112821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51932790 + ... + 52137751.

It is an arithmetic number, because the mean of its divisors is an integer number (2666339321311).

Almost surely, 2^{10665253112221} is an apocalyptic number.

It is an amenable number.

10665253112221 is a deficient number, since it is larger than the sum of its proper divisors (104173023).

10665253112221 is a wasteful number, since it uses less digits than its factorization.

10665253112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104173022.

The product of its (nonzero) digits is 43200, while the sum is 37.

Adding to 10665253112221 its reverse (12221135256601), we get a palindrome (22886388368822).

The spelling of 10665253112221 in words is "ten trillion, six hundred sixty-five billion, two hundred fifty-three million, one hundred twelve thousand, two hundred twenty-one".