1133021521 has 4 divisors (see below), whose sum is σ = 1133424292. Its totient is φ = 1132618752.

The previous prime is 1133021459. The next prime is 1133021543. The reversal of 1133021521 is 1251203311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1251203311 = 2063 ⋅606497.

It can be written as a sum of positive squares in 2 ways, for example, as 439489296 + 693532225 = 20964^2 + 26335^2 .

It is a cyclic number.

It is not a de Polignac number, because 1133021521 - 2²¹ = 1130924369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1133021551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197136 + ... + 202801.

It is an arithmetic number, because the mean of its divisors is an integer number (283356073).

Almost surely, 2^1133021521 is an apocalyptic number.

It is an amenable number.

1133021521 is a deficient number, since it is larger than the sum of its proper divisors (402771).

1133021521 is an equidigital number, since it uses as much as digits as its factorization.

1133021521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402770.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1133021521 is about 33660.3850393901. The cubic root of 1133021521 is about 1042.5079760233.

Adding to 1133021521 its reverse (1251203311), we get a palindrome (2384224832).

The spelling of 1133021521 in words is "one billion, one hundred thirty-three million, twenty-one thousand, five hundred twenty-one".