212022111221 has 4 divisors (see below), whose sum is σ = 212034528000. Its totient is φ = 212009694444.

The previous prime is 212022111209. The next prime is 212022111277. The reversal of 212022111221 is 122111220212.

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 212022111221 - 2¹⁰ = 212022110197 is a prime.

It is a super-3 number, since 3×212022111221³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212022111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212022111121) 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, 6182741 + ... + 6216938.

It is an arithmetic number, because the mean of its divisors is an integer number (53008632000).

Almost surely, 2^212022111221 is an apocalyptic number.

It is an amenable number.

212022111221 is a deficient number, since it is larger than the sum of its proper divisors (12416779).

212022111221 is a wasteful number, since it uses less digits than its factorization.

212022111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12416778.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212022111221 its reverse (122111220212), we get a palindrome (334133331433).

The spelling of 212022111221 in words is "two hundred twelve billion, twenty-two million, one hundred eleven thousand, two hundred twenty-one".