2133555521 has 4 divisors (see below), whose sum is σ = 2142954672. Its totient is φ = 2124156372.

The previous prime is 2133555511. The next prime is 2133555527. The reversal of 2133555521 is 1255553312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2133555521 - 2¹⁸ = 2133293377 is a prime.

It is a super-3 number, since 3×2133555521³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2133555527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4699235 + ... + 4699688.

It is an arithmetic number, because the mean of its divisors is an integer number (535738668).

Almost surely, 2^2133555521 is an apocalyptic number.

It is an amenable number.

2133555521 is a deficient number, since it is larger than the sum of its proper divisors (9399151).

2133555521 is an equidigital number, since it uses as much as digits as its factorization.

2133555521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9399150.

The product of its digits is 22500, while the sum is 32.

The square root of 2133555521 is about 46190.4267245931. The cubic root of 2133555521 is about 1287.3638695547.

The spelling of 2133555521 in words is "two billion, one hundred thirty-three million, five hundred fifty-five thousand, five hundred twenty-one".