2121243320 has 96 divisors (see below), whose sum is σ = 5681372400. Its totient is φ = 710341632.

The previous prime is 2121243283. The next prime is 2121243331. The reversal of 2121243320 is 233421212.

It is a super-3 number, since 3×2121243320³ (a number of 29 digits) contains 333 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 2121243292 and 2121243301.

It is a congruent number.

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, 71696 + ... + 96864.

Almost surely, 2^2121243320 is an apocalyptic number.

2121243320 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 2121243320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2840686200).

2121243320 is an abundant number, since it is smaller than the sum of its proper divisors (3560129080).

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

2121243320 is a wasteful number, since it uses less digits than its factorization.

2121243320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25237 (or 25226 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 2121243320 is about 46056.9573463120. The cubic root of 2121243320 is about 1284.8827420042.

Adding to 2121243320 its reverse (233421212), we get a palindrome (2354664532).

The spelling of 2121243320 in words is "two billion, one hundred twenty-one million, two hundred forty-three thousand, three hundred twenty".