1221113331 has 24 divisors (see below), whose sum is σ = 1829487504. Its totient is φ = 784209600.

The previous prime is 1221113329. The next prime is 1221113339. The reversal of 1221113331 is 1333111221.

1221113331 is a `hidden beast` number, since 1 + 221 + 113 + 331 = 666.

It is not a de Polignac number, because 1221113331 - 2¹ = 1221113329 is a prime.

It is a super-2 number, since 2×1221113331² = 2982235534291831122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221113339) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15480 + ... + 51786.

It is an arithmetic number, because the mean of its divisors is an integer number (76228646).

Almost surely, 2^1221113331 is an apocalyptic number.

1221113331 is a deficient number, since it is larger than the sum of its proper divisors (608374173).

1221113331 is a wasteful number, since it uses less digits than its factorization.

1221113331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36451 (or 36448 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1221113331 is about 34944.4320457494. The cubic root of 1221113331 is about 1068.8546661011.

Adding to 1221113331 its reverse (1333111221), we get a palindrome (2554224552).

The spelling of 1221113331 in words is "one billion, two hundred twenty-one million, one hundred thirteen thousand, three hundred thirty-one".