212203111221 has 12 divisors (see below), whose sum is σ = 319842370848. Its totient is φ = 135317925864.

The previous prime is 212203111193. The next prime is 212203111223. The reversal of 212203111221 is 122111302212.

212203111221 is a `hidden beast` number, since 212 + 20 + 311 + 122 + 1 = 666.

It is not a de Polignac number, because 212203111221 - 2⁵ = 212203111189 is a prime.

It is a super-2 number, since 2×212203111221² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212203111194 and 212203111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212203111223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 512567695 + ... + 512568108.

It is an arithmetic number, because the mean of its divisors is an integer number (26653530904).

Almost surely, 2^212203111221 is an apocalyptic number.

It is an amenable number.

212203111221 is a deficient number, since it is larger than the sum of its proper divisors (107639259627).

212203111221 is a wasteful number, since it uses less digits than its factorization.

212203111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025135832 (or 1025135829 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 212203111221 its reverse (122111302212), we get a palindrome (334314413433).

The spelling of 212203111221 in words is "two hundred twelve billion, two hundred three million, one hundred eleven thousand, two hundred twenty-one".