2123120400 has 120 divisors (see below), whose sum is σ = 6846686784. Its totient is φ = 562368000.

The previous prime is 2123120387. The next prime is 2123120423. The reversal of 2123120400 is 40213212.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2123120400.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175342 + ... + 187058.

Almost surely, 2^2123120400 is an apocalyptic number.

2123120400 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 2123120400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3423343392).

2123120400 is an abundant number, since it is smaller than the sum of its proper divisors (4723566384).

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

2123120400 is a wasteful number, since it uses less digits than its factorization.

2123120400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11889 (or 11878 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 2123120400 is about 46077.3306518509. The cubic root of 2123120400 is about 1285.2616261895.

Adding to 2123120400 its reverse (40213212), we get a palindrome (2163333612).

The spelling of 2123120400 in words is "two billion, one hundred twenty-three million, one hundred twenty thousand, four hundred".