2121353300 has 72 divisors (see below), whose sum is σ = 5040427392. Its totient is φ = 768544000.

The previous prime is 2121353257. The next prime is 2121353303. The reversal of 2121353300 is 33531212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121353303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 305669 + ... + 312531.

It is an arithmetic number, because the mean of its divisors is an integer number (70005936).

Almost surely, 2^2121353300 is an apocalyptic number.

2121353300 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 2121353300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2520213696).

2121353300 is an abundant number, since it is smaller than the sum of its proper divisors (2919074092).

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

2121353300 is a wasteful number, since it uses less digits than its factorization.

2121353300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7169 (or 7162 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 2121353300 is about 46058.1512872586. The cubic root of 2121353300 is about 1284.9049473716.

Adding to 2121353300 its reverse (33531212), we get a palindrome (2154884512).

The spelling of 2121353300 in words is "two billion, one hundred twenty-one million, three hundred fifty-three thousand, three hundred".