212101210 has 16 divisors (see below), whose sum is σ = 383763816. Its totient is φ = 84400128.

The previous prime is 212101207. The next prime is 212101223. The reversal of 212101210 is 12101212.

212101210 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 4 ways, for example, as 113912929 + 98188281 = 10673^2 + 9909^2 .

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

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53019 + ... + 56878.

Almost surely, 2^212101210 is an apocalyptic number.

212101210 is a deficient number, since it is larger than the sum of its proper divisors (171662606).

212101210 is a wasteful number, since it uses less digits than its factorization.

212101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110097.

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

The square root of 212101210 is about 14563.6949295157. The cubic root of 212101210 is about 596.3680687446.

Adding to 212101210 its reverse (12101212), we get a palindrome (224202422).

The spelling of 212101210 in words is "two hundred twelve million, one hundred one thousand, two hundred ten".