212201111221 has 4 divisors (see below), whose sum is σ = 231492121344. Its totient is φ = 192910101100.

The previous prime is 212201111191. The next prime is 212201111249. The reversal of 212201111221 is 122111102212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212201111221 - 2²⁹ = 211664240309 is a prime.

It is a super-2 number, since 2×212201111221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212201111195 and 212201111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212201111251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9645505045 + ... + 9645505066.

It is an arithmetic number, because the mean of its divisors is an integer number (57873030336).

Almost surely, 2^212201111221 is an apocalyptic number.

It is an amenable number.

212201111221 is a deficient number, since it is larger than the sum of its proper divisors (19291010123).

212201111221 is a wasteful number, since it uses less digits than its factorization.

212201111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19291010122.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212201111221 its reverse (122111102212), we get a palindrome (334312213433).

Subtracting from 212201111221 its reverse (122111102212), we obtain a palindrome (90090009009).

The spelling of 212201111221 in words is "two hundred twelve billion, two hundred one million, one hundred eleven thousand, two hundred twenty-one".