11311023221 has 8 divisors (see below), whose sum is σ = 11381424600. Its totient is φ = 11240709120.

The previous prime is 11311023197. The next prime is 11311023233. The reversal of 11311023221 is 12232011311.

It can be written as a sum of positive squares in 4 ways, for example, as 255552196 + 11055471025 = 15986^2 + 105145^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11311023221 - 2¹⁰ = 11311022197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11311023221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311023721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248525 + ... + 290493.

It is an arithmetic number, because the mean of its divisors is an integer number (1422678075).

Almost surely, 2^11311023221 is an apocalyptic number.

It is an amenable number.

11311023221 is a deficient number, since it is larger than the sum of its proper divisors (70401379).

11311023221 is a wasteful number, since it uses less digits than its factorization.

11311023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43639.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11311023221 its reverse (12232011311), we get a palindrome (23543034532).

The spelling of 11311023221 in words is "eleven billion, three hundred eleven million, twenty-three thousand, two hundred twenty-one".