2101021210 has 8 divisors (see below), whose sum is σ = 3781838196. Its totient is φ = 840408480.

The previous prime is 2101021193. The next prime is 2101021217. The reversal of 2101021210 is 121201012.

It can be written as a sum of positive squares in 2 ways, for example, as 2088764209 + 12257001 = 45703^2 + 3501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 210102121 = 2101021210 / (2 + 1 + 0 + 1 + 0 + 2 + 1 + 2 + 1 + 0).

It is not an unprimeable number, because it can be changed into a prime (2101021217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105051051 + ... + 105051070.

Almost surely, 2^2101021210 is an apocalyptic number.

2101021210 is a deficient number, since it is larger than the sum of its proper divisors (1680816986).

2101021210 is a wasteful number, since it uses less digits than its factorization.

2101021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210102128.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2101021210 is about 45836.8979098717. The cubic root of 2101021210 is about 1280.7867091662.

Adding to 2101021210 its reverse (121201012), we get a palindrome (2222222222).

The spelling of 2101021210 in words is "two billion, one hundred one million, twenty-one thousand, two hundred ten".