2121634231 has 4 divisors (see below), whose sum is σ = 2121823600. Its totient is φ = 2121444864.

The previous prime is 2121634223. The next prime is 2121634247. The reversal of 2121634231 is 1324361212.

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 2121634231 - 2³ = 2121634223 is a prime.

It is a super-2 number, since 2×2121634231² = 9002663620301922722, 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 = 2121634196 and 2121634205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121634331) 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, 76746 + ... + 100663.

It is an arithmetic number, because the mean of its divisors is an integer number (530455900).

Almost surely, 2^2121634231 is an apocalyptic number.

2121634231 is a deficient number, since it is larger than the sum of its proper divisors (189369).

2121634231 is a wasteful number, since it uses less digits than its factorization.

2121634231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189368.

The product of its digits is 1728, while the sum is 25.

The square root of 2121634231 is about 46061.2009287643. The cubic root of 2121634231 is about 1284.9616648922.

Adding to 2121634231 its reverse (1324361212), we get a palindrome (3445995443).

The spelling of 2121634231 in words is "two billion, one hundred twenty-one million, six hundred thirty-four thousand, two hundred thirty-one".