211210201221 has 64 divisors (see below), whose sum is σ = 305392896000. Its totient is φ = 129525555456.

The previous prime is 211210201159. The next prime is 211210201273. The reversal of 211210201221 is 122102012112.

It is not a de Polignac number, because 211210201221 - 2¹⁰ = 211210200197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211210201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210201291) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40638195 + ... + 40643391.

It is an arithmetic number, because the mean of its divisors is an integer number (4771764000).

Almost surely, 2^211210201221 is an apocalyptic number.

It is an amenable number.

211210201221 is a deficient number, since it is larger than the sum of its proper divisors (94182694779).

211210201221 is a wasteful number, since it uses less digits than its factorization.

211210201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5498.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211210201221 its reverse (122102012112), we get a palindrome (333312213333).

The spelling of 211210201221 in words is "two hundred eleven billion, two hundred ten million, two hundred one thousand, two hundred twenty-one".