11311120231221 has 8 divisors (see below), whose sum is σ = 15129677328640. Its totient is φ = 7516654977312.

The previous prime is 11311120231219. The next prime is 11311120231309. The reversal of 11311120231221 is 12213202111311.

11311120231221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 11311120231221 - 2¹ = 11311120231219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311120231211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6022959781 + ... + 6022961658.

It is an arithmetic number, because the mean of its divisors is an integer number (1891209666080).

Almost surely, 2^{11311120231221} is an apocalyptic number.

It is an amenable number.

11311120231221 is a deficient number, since it is larger than the sum of its proper divisors (3818557097419).

11311120231221 is a wasteful number, since it uses less digits than its factorization.

11311120231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12045921755.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 11311120231221 its reverse (12213202111311), we get a palindrome (23524322342532).

The spelling of 11311120231221 in words is "eleven trillion, three hundred eleven billion, one hundred twenty million, two hundred thirty-one thousand, two hundred twenty-one".