2121245000 has 80 divisors (see below), whose sum is σ = 5680181760. Its totient is φ = 727272000.

The previous prime is 2121244981. The next prime is 2121245011. The reversal of 2121245000 is 5421212.

It is a super-3 number, since 3×2121245000³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2121245000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4697 + ... + 65303.

It is an arithmetic number, because the mean of its divisors is an integer number (71002272).

Almost surely, 2^2121245000 is an apocalyptic number.

2121245000 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 2121245000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2840090880).

2121245000 is an abundant number, since it is smaller than the sum of its proper divisors (3558936760).

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

2121245000 is an equidigital number, since it uses as much as digits as its factorization.

2121245000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60640 (or 60621 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 2121245000 is about 46056.9755845952. The cubic root of 2121245000 is about 1284.8830812081.

Adding to 2121245000 its reverse (5421212), we get a palindrome (2126666212).

The spelling of 2121245000 in words is "two billion, one hundred twenty-one million, two hundred forty-five thousand".