11220001331231 has 32 divisors (see below), whose sum is σ = 14314672593408. Its totient is φ = 8539068263040.

The previous prime is 11220001331221. The next prime is 11220001331243. The reversal of 11220001331231 is 13213310002211.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-11220001331231 is a prime.

It is a super-2 number, since 2×11220001331231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220001331221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67902245 + ... + 68067281.

It is an arithmetic number, because the mean of its divisors is an integer number (447333518544).

Almost surely, 2^{11220001331231} is an apocalyptic number.

11220001331231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11220001331231 is a deficient number, since it is larger than the sum of its proper divisors (3094671262177).

11220001331231 is a wasteful number, since it uses less digits than its factorization.

11220001331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185631.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 11220001331231 its reverse (13213310002211), we get a palindrome (24433311333442).

The spelling of 11220001331231 in words is "eleven trillion, two hundred twenty billion, one million, three hundred thirty-one thousand, two hundred thirty-one".