2121040000 has 80 divisors (see below), whose sum is σ = 5280395670. Its totient is φ = 848384000.

The previous prime is 2121039989. The next prime is 2121040027. The reversal of 2121040000 is 401212.

It can be written as a sum of positive squares in 5 ways, for example, as 10188864 + 2110851136 = 3192^2 + 45944^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 66744 + ... + 93256.

Almost surely, 2^2121040000 is an apocalyptic number.

2121040000 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 2121040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2640197835).

2121040000 is an abundant number, since it is smaller than the sum of its proper divisors (3159355670).

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

2121040000 is an frugal number, since it uses more digits than its factorization.

2121040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26547 (or 26520 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2121040000 is about 46054.7500264631. The cubic root of 2121040000 is about 1284.8416889256.

Adding to 2121040000 its reverse (401212), we get a palindrome (2121441212).

The spelling of 2121040000 in words is "two billion, one hundred twenty-one million, forty thousand".