1111012221 has 16 divisors (see below), whose sum is σ = 1632022848. Its totient is φ = 666672000.

The previous prime is 1111012163. The next prime is 1111012249. The reversal of 1111012221 is 1222101111.

It is not a de Polignac number, because 1111012221 - 2¹⁰ = 1111011197 is a prime.

It is a super-2 number, since 2×1111012221² = 2468696310422705682, which contains 22 as substring.

1111012221 is a modest number, since divided by 12221 gives 1111 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1111012197 and 1111012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111012261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163336 + ... + 170001.

It is an arithmetic number, because the mean of its divisors is an integer number (102001428).

Almost surely, 2^1111012221 is an apocalyptic number.

1111012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111012221 is a deficient number, since it is larger than the sum of its proper divisors (521010627).

1111012221 is a wasteful number, since it uses less digits than its factorization.

1111012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333452.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1111012221 is about 33331.8499486602. The cubic root of 1111012221 is about 1035.7134402829.

Adding to 1111012221 its reverse (1222101111), we get a palindrome (2333113332).

The spelling of 1111012221 in words is "one billion, one hundred eleven million, twelve thousand, two hundred twenty-one".