2121212210 has 16 divisors (see below), whose sum is σ = 4111888536. Its totient is φ = 783216768.

The previous prime is 2121212209. The next prime is 2121212263. The reversal of 2121212210 is 122121212.

It can be written as a sum of positive squares in 4 ways, for example, as 1348872529 + 772339681 = 36727^2 + 27791^2 .

It is an unprimeable number.

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, 8158379 + ... + 8158638.

Almost surely, 2^2121212210 is an apocalyptic number.

2121212210 is a deficient number, since it is larger than the sum of its proper divisors (1990676326).

2121212210 is a wasteful number, since it uses less digits than its factorization.

2121212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16317037.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2121212210 is about 46056.6196110831. The cubic root of 2121212210 is about 1284.8764606412.

Adding to 2121212210 its reverse (122121212), we get a palindrome (2243333422).

The spelling of 2121212210 in words is "two billion, one hundred twenty-one million, two hundred twelve thousand, two hundred ten".