1011221133 has 12 divisors (see below), whose sum is σ = 1459988640. Its totient is φ = 622289616.

The previous prime is 1011221129. The next prime is 1011221161. The reversal of 1011221133 is 3311221101.

It is a happy number.

It is not a de Polignac number, because 1011221133 - 2² = 1011221129 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 996753 + ... + 997766.

It is an arithmetic number, because the mean of its divisors is an integer number (121665720).

Almost surely, 2^1011221133 is an apocalyptic number.

1011221133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1011221133 is a deficient number, since it is larger than the sum of its proper divisors (448767507).

1011221133 is a wasteful number, since it uses less digits than its factorization.

1011221133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994548 (or 1994535 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1011221133 is about 31799.7033476729. The cubic root of 1011221133 is about 1003.7264738102.

Adding to 1011221133 its reverse (3311221101), we get a palindrome (4322442234).

The spelling of 1011221133 in words is "one billion, eleven million, two hundred twenty-one thousand, one hundred thirty-three".