2123131100 has 72 divisors (see below), whose sum is σ = 4803609216. Its totient is φ = 813600000.

The previous prime is 2123131099. The next prime is 2123131133. The reversal of 2123131100 is 11313212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 309710 + ... + 316490.

Almost surely, 2^2123131100 is an apocalyptic number.

2123131100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2123131100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2401804608).

2123131100 is an abundant number, since it is smaller than the sum of its proper divisors (2680478116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2123131100 is a wasteful number, since it uses less digits than its factorization.

2123131100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6927 (or 6920 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 2123131100 is about 46077.4467608612. The cubic root of 2123131100 is about 1285.2637853191.

Adding to 2123131100 its reverse (11313212), we get a palindrome (2134444312).

The spelling of 2123131100 in words is "two billion, one hundred twenty-three million, one hundred thirty-one thousand, one hundred".