211210102012221 has 128 divisors (see below), whose sum is σ = 340323153730560. Its totient is φ = 128691763200000.

The previous prime is 211210102012163. The next prime is 211210102012307. The reversal of 211210102012221 is 122210201012112.

211210102012221 is a `hidden beast` number, since 21 + 1 + 210 + 10 + 201 + 2 + 221 = 666.

It is not a de Polignac number, because 211210102012221 - 2¹⁸ = 211210101750077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211210102012194 and 211210102012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210102032221) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10549418191 + ... + 10549438211.

It is an arithmetic number, because the mean of its divisors is an integer number (2658774638520).

Almost surely, 2^{211210102012221} is an apocalyptic number.

It is an amenable number.

211210102012221 is a deficient number, since it is larger than the sum of its proper divisors (129113051718339).

211210102012221 is a wasteful number, since it uses less digits than its factorization.

211210102012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20996 (or 20990 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211210102012221 its reverse (122210201012112), we get a palindrome (333420303024333).

The spelling of 211210102012221 in words is "two hundred eleven trillion, two hundred ten billion, one hundred two million, twelve thousand, two hundred twenty-one".