2120817231 has 12 divisors (see below), whose sum is σ = 3299049208. Its totient is φ = 1305118224.

The previous prime is 2120817203. The next prime is 2120817301. The reversal of 2120817231 is 1327180212.

It is not a de Polignac number, because 2120817231 - 2¹⁰ = 2120816207 is a prime.

It is a super-2 number, since 2×2120817231² = 8995731454613014722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2120817195 and 2120817204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120817931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9063205 + ... + 9063438.

Almost surely, 2^2120817231 is an apocalyptic number.

2120817231 is a deficient number, since it is larger than the sum of its proper divisors (1178231977).

2120817231 is a wasteful number, since it uses less digits than its factorization.

2120817231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18126662 (or 18126659 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 2120817231 is about 46052.3314393528. The cubic root of 2120817231 is about 1284.7967058168.

Adding to 2120817231 its reverse (1327180212), we get a palindrome (3447997443).

The spelling of 2120817231 in words is "two billion, one hundred twenty million, eight hundred seventeen thousand, two hundred thirty-one".