1111331221 has 48 divisors (see below), whose sum is σ = 1528329600. Its totient is φ = 794344320.

The previous prime is 1111331213. The next prime is 1111331237. The reversal of 1111331221 is 1221331111.

It is a happy number.

It is not a de Polignac number, because 1111331221 - 2³ = 1111331213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111331195 and 1111331204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111331201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1393995 + ... + 1394791.

It is an arithmetic number, because the mean of its divisors is an integer number (31840200).

Almost surely, 2^1111331221 is an apocalyptic number.

1111331221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111331221 is a deficient number, since it is larger than the sum of its proper divisors (416998379).

1111331221 is a wasteful number, since it uses less digits than its factorization.

1111331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034 (or 1027 counting only the distinct ones).

The product of its digits is 36, while the sum is 16.

The square root of 1111331221 is about 33336.6348181696. The cubic root of 1111331221 is about 1035.8125573957.

Adding to 1111331221 its reverse (1221331111), we get a palindrome (2332662332).

The spelling of 1111331221 in words is "one billion, one hundred eleven million, three hundred thirty-one thousand, two hundred twenty-one".