221212100211201 has 64 divisors (see below), whose sum is σ = 392693278464000. Its totient is φ = 121489482882240.

The previous prime is 221212100211199. The next prime is 221212100211257. The reversal of 221212100211201 is 102112001212122.

221212100211201 is a `hidden beast` number, since 2 + 21 + 21 + 210 + 0 + 211 + 201 = 666.

It is not a de Polignac number, because 221212100211201 - 2¹ = 221212100211199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221212100211281) 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, 852069166 + ... + 852328743.

It is an arithmetic number, because the mean of its divisors is an integer number (6135832476000).

Almost surely, 2^{221212100211201} is an apocalyptic number.

It is an amenable number.

221212100211201 is a deficient number, since it is larger than the sum of its proper divisors (171481178252799).

221212100211201 is a wasteful number, since it uses less digits than its factorization.

221212100211201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704397971 (or 1704397965 counting only the distinct ones).

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

Adding to 221212100211201 its reverse (102112001212122), we get a palindrome (323324101423323).

The spelling of 221212100211201 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred million, two hundred eleven thousand, two hundred one".