2121202000 has 80 divisors (see below), whose sum is σ = 5180342544. Its totient is φ = 840000000.

The previous prime is 2121201991. The next prime is 2121202003. The reversal of 2121202000 is 2021212.

It can be written as a sum of positive squares in 8 ways, for example, as 350138944 + 1771063056 = 18712^2 + 42084^2 .

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121202003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196750 + ... + 207250.

Almost surely, 2^2121202000 is an apocalyptic number.

2121202000 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 2121202000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2590171272).

2121202000 is an abundant number, since it is smaller than the sum of its proper divisors (3059140544).

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

2121202000 is a wasteful number, since it uses less digits than its factorization.

2121202000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10625 (or 10609 counting only the distinct ones).

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

The square root of 2121202000 is about 46056.5087691197. The cubic root of 2121202000 is about 1284.8743991455.

Adding to 2121202000 its reverse (2021212), we get a palindrome (2123223212).

The spelling of 2121202000 in words is "two billion, one hundred twenty-one million, two hundred two thousand".