2100021010 has 16 divisors (see below), whose sum is σ = 3804117336. Its totient is φ = 834657408.

The previous prime is 2100020983. The next prime is 2100021013. The reversal of 2100021010 is 101200012.

It can be written as a sum of positive squares in 4 ways, for example, as 1805315121 + 294705889 = 42489^2 + 17167^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2100020984 and 2100021002.

It is not an unprimeable number, because it can be changed into a prime (2100021013) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 667227 + ... + 670366.

Almost surely, 2^2100021010 is an apocalyptic number.

2100021010 is a deficient number, since it is larger than the sum of its proper divisors (1704096326).

2100021010 is a wasteful number, since it uses less digits than its factorization.

2100021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337757.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 2100021010 is about 45825.9861868787. The cubic root of 2100021010 is about 1280.5834356031.

Adding to 2100021010 its reverse (101200012), we get a palindrome (2201221022).

The spelling of 2100021010 in words is "two billion, one hundred million, twenty-one thousand, ten".