2121201220210 has 32 divisors (see below), whose sum is σ = 3820713545520. Its totient is φ = 847913730048.

The previous prime is 2121201220199. The next prime is 2121201220247. The reversal of 2121201220210 is 120221021212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 404894233969 + 1716306986241 = 636313^2 + 1310079^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110051134 + ... + 110070406.

Almost surely, 2^{2121201220210} is an apocalyptic number.

2121201220210 is a deficient number, since it is larger than the sum of its proper divisors (1699512325310).

2121201220210 is a wasteful number, since it uses less digits than its factorization.

2121201220210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26062.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2121201220210 its reverse (120221021212), we get a palindrome (2241422241422).

The spelling of 2121201220210 in words is "two trillion, one hundred twenty-one billion, two hundred one million, two hundred twenty thousand, two hundred ten".