1133121021 has 24 divisors (see below), whose sum is σ = 1582493952. Its totient is φ = 720451200.

The previous prime is 1133120987. The next prime is 1133121023. The reversal of 1133121021 is 1201213311.

It is a happy number.

It is not a de Polignac number, because 1133121021 - 2⁶ = 1133120957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1133121023) 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, 467605 + ... + 470021.

It is an arithmetic number, because the mean of its divisors is an integer number (65937248).

Almost surely, 2^1133121021 is an apocalyptic number.

It is an amenable number.

1133121021 is a deficient number, since it is larger than the sum of its proper divisors (449372931).

1133121021 is an equidigital number, since it uses as much as digits as its factorization.

1133121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2593 (or 2522 counting only the distinct ones).

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

The square root of 1133121021 is about 33661.8630054844. The cubic root of 1133121021 is about 1042.5384922155.

Adding to 1133121021 its reverse (1201213311), we get a palindrome (2334334332).

The spelling of 1133121021 in words is "one billion, one hundred thirty-three million, one hundred twenty-one thousand, twenty-one".