2121112400 has 60 divisors (see below), whose sum is σ = 5559254304. Its totient is φ = 771312000.

The previous prime is 2121112391. The next prime is 2121112447. The reversal of 2121112400 is 42111212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236636 + ... + 245435.

Almost surely, 2^2121112400 is an apocalyptic number.

2121112400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121112400 is an abundant number, since it is smaller than the sum of its proper divisors (3438141904).

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

2121112400 is a wasteful number, since it uses less digits than its factorization.

2121112400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482100 (or 482089 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2121112400 is about 46055.5360407411. The cubic root of 2121112400 is about 1284.8563077729.

Adding to 2121112400 its reverse (42111212), we get a palindrome (2163223612).

The spelling of 2121112400 in words is "two billion, one hundred twenty-one million, one hundred twelve thousand, four hundred".