2121122231 has 4 divisors (see below), whose sum is σ = 2150997264. Its totient is φ = 2091247200.

The previous prime is 2121122221. The next prime is 2121122243. The reversal of 2121122231 is 1322211212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121122231 - 2¹⁰ = 2121121207 is a prime.

It is a super-2 number, since 2×2121122231² = 8998319037684834722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121122221) 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, 14937410 + ... + 14937551.

It is an arithmetic number, because the mean of its divisors is an integer number (537749316).

Almost surely, 2^2121122231 is an apocalyptic number.

2121122231 is a deficient number, since it is larger than the sum of its proper divisors (29875033).

2121122231 is an equidigital number, since it uses as much as digits as its factorization.

2121122231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29875032.

The product of its digits is 96, while the sum is 17.

The square root of 2121122231 is about 46055.6427704576. The cubic root of 2121122231 is about 1284.8582928010.

Adding to 2121122231 its reverse (1322211212), we get a palindrome (3443333443).

The spelling of 2121122231 in words is "two billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred thirty-one".