11212151165 has 4 divisors (see below), whose sum is σ = 13454581404. Its totient is φ = 8969720928.

The previous prime is 11212151131. The next prime is 11212151179. The reversal of 11212151165 is 56115121211.

It is a happy number.

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 7441822756 + 3770328409 = 86266^2 + 61403^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212151165 - 2⁶ = 11212151101 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, 1121215112 + ... + 1121215121.

It is an arithmetic number, because the mean of its divisors is an integer number (3363645351).

Almost surely, 2^11212151165 is an apocalyptic number.

It is an amenable number.

11212151165 is a deficient number, since it is larger than the sum of its proper divisors (2242430239).

11212151165 is an equidigital number, since it uses as much as digits as its factorization.

11212151165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242430238.

The product of its digits is 600, while the sum is 26.

Adding to 11212151165 its reverse (56115121211), we get a palindrome (67327272376).

The spelling of 11212151165 in words is "eleven billion, two hundred twelve million, one hundred fifty-one thousand, one hundred sixty-five".