2102123031 has 4 divisors (see below), whose sum is σ = 2802830712. Its totient is φ = 1401415352.

The previous prime is 2102123027. The next prime is 2102123039. The reversal of 2102123031 is 1303212012.

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 2102123031 - 2² = 2102123027 is a prime.

It is a super-2 number, since 2×2102123031² = 8837842474921253922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2102123031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102123039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350353836 + ... + 350353841.

It is an arithmetic number, because the mean of its divisors is an integer number (700707678).

Almost surely, 2^2102123031 is an apocalyptic number.

2102123031 is a deficient number, since it is larger than the sum of its proper divisors (700707681).

2102123031 is an equidigital number, since it uses as much as digits as its factorization.

2102123031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700707680.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2102123031 is about 45848.9152652492. The cubic root of 2102123031 is about 1281.0105607977.

Adding to 2102123031 its reverse (1303212012), we get a palindrome (3405335043).

The spelling of 2102123031 in words is "two billion, one hundred two million, one hundred twenty-three thousand, thirty-one".