212120111221 has 8 divisors (see below), whose sum is σ = 216931968000. Its totient is φ = 207361424400.

The previous prime is 212120111219. The next prime is 212120111233. The reversal of 212120111221 is 122111021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212120111221 - 2¹ = 212120111219 is a prime.

It is a super-2 number, since 2×212120111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212120111195 and 212120111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120211221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13284421 + ... + 13300378.

It is an arithmetic number, because the mean of its divisors is an integer number (27116496000).

Almost surely, 2^212120111221 is an apocalyptic number.

It is an amenable number.

212120111221 is a deficient number, since it is larger than the sum of its proper divisors (4811856779).

212120111221 is a wasteful number, since it uses less digits than its factorization.

212120111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26584979.

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

Adding to 212120111221 its reverse (122111021212), we get a palindrome (334231132433).

Subtracting from 212120111221 its reverse (122111021212), we obtain a palindrome (90009090009).

The spelling of 212120111221 in words is "two hundred twelve billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty-one".