2121102031 has 4 divisors (see below), whose sum is σ = 2232739000. Its totient is φ = 2009465064.

The previous prime is 2121102001. The next prime is 2121102041. The reversal of 2121102031 is 1302011212.

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 2121102031 - 2⁵ = 2121101999 is a prime.

It is a super-2 number, since 2×2121102031² = 8998147651824649922, 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 (2121102001) 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, 55818456 + ... + 55818493.

It is an arithmetic number, because the mean of its divisors is an integer number (558184750).

Almost surely, 2^2121102031 is an apocalyptic number.

2121102031 is a deficient number, since it is larger than the sum of its proper divisors (111636969).

2121102031 is a wasteful number, since it uses less digits than its factorization.

2121102031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111636968.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2121102031 is about 46055.4234699889. The cubic root of 2121102031 is about 1284.8542141079.

Adding to 2121102031 its reverse (1302011212), we get a palindrome (3423113243).

The spelling of 2121102031 in words is "two billion, one hundred twenty-one million, one hundred two thousand, thirty-one".