222121121111221 has 4 divisors (see below), whose sum is σ = 222233360184000. Its totient is φ = 222008882038444.

The previous prime is 222121121111189. The next prime is 222121121111243. The reversal of 222121121111221 is 122111121121222.

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 222121121111221 - 2⁵ = 222121121111189 is a prime.

It is a super-2 number, since 2×222121121111221² (a number of 29 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 = 222121121111192 and 222121121111201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121121211221) 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, 56119533421 + ... + 56119537378.

It is an arithmetic number, because the mean of its divisors is an integer number (55558340046000).

Almost surely, 2^{222121121111221} is an apocalyptic number.

It is an amenable number.

222121121111221 is a deficient number, since it is larger than the sum of its proper divisors (112239072779).

222121121111221 is a wasteful number, since it uses less digits than its factorization.

222121121111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112239072778.

The product of its digits is 128, while the sum is 22.

Adding to 222121121111221 its reverse (122111121121222), we get a palindrome (344232242232443).

The spelling of 222121121111221 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".