211210000012221 has 16 divisors (see below), whose sum is σ = 321886219036800. Its totient is φ = 120675525018048.

The previous prime is 211210000012211. The next prime is 211210000012237. The reversal of 211210000012221 is 122210000012112.

It is not a de Polignac number, because 211210000012221 - 2⁷ = 211210000012093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211210000012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210000012201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 662485186 + ... + 662803923.

It is an arithmetic number, because the mean of its divisors is an integer number (20117888689800).

Almost surely, 2^{211210000012221} is an apocalyptic number.

211210000012221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211210000012221 is a deficient number, since it is larger than the sum of its proper divisors (110676219024579).

211210000012221 is a wasteful number, since it uses less digits than its factorization.

211210000012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325296708.

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

Adding to 211210000012221 its reverse (122210000012112), we get a palindrome (333420000024333).

The spelling of 211210000012221 in words is "two hundred eleven trillion, two hundred ten billion, twelve thousand, two hundred twenty-one".