2123100 has 108 divisors (see below), whose sum is σ = 7627984. Its totient is φ = 483840.

The previous prime is 2123087. The next prime is 2123123. The reversal of 2123100 is 13212.

It is a happy number.

2123100 is nontrivially palindromic in base 13.

It is a super-2 number, since 2×2123100² = 9015107220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6132 + ... + 6468.

2^2123100 is an apocalyptic number.

2123100 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 2123100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3813992).

2123100 is an abundant number, since it is smaller than the sum of its proper divisors (5504884).

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

2123100 is a wasteful number, since it uses less digits than its factorization.

2123100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2123100 is about 1457.0861333497. The cubic root of 2123100 is about 128.5257509698.

Adding to 2123100 its reverse (13212), we get a palindrome (2136312).

The spelling of 2123100 in words is "two million, one hundred twenty-three thousand, one hundred".