2121133231 has 8 divisors (see below), whose sum is σ = 2566749600. Its totient is φ = 1711166208.

The previous prime is 2121133207. The next prime is 2121133247. The reversal of 2121133231 is 1323311212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121133231 - 2¹⁷ = 2121002159 is a prime.

It is a super-2 number, since 2×2121133231² = 8998412367304998722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121133199 and 2121133208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121133291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8912206 + ... + 8912443.

It is an arithmetic number, because the mean of its divisors is an integer number (320843700).

Almost surely, 2^2121133231 is an apocalyptic number.

2121133231 is a deficient number, since it is larger than the sum of its proper divisors (445616369).

2121133231 is a wasteful number, since it uses less digits than its factorization.

2121133231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17824673.

The product of its digits is 216, while the sum is 19.

The square root of 2121133231 is about 46055.7621910657. The cubic root of 2121133231 is about 1284.8605138606.

Adding to 2121133231 its reverse (1323311212), we get a palindrome (3444444443).

The spelling of 2121133231 in words is "two billion, one hundred twenty-one million, one hundred thirty-three thousand, two hundred thirty-one".