222222121111221 has 16 divisors (see below), whose sum is σ = 369408201328128. Its totient is φ = 115440062914800.

The previous prime is 222222121111217. The next prime is 222222121111247. The reversal of 222222121111221 is 122111121222222.

222222121111221 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 222222121111221 - 2² = 222222121111217 is a prime.

It is a super-4 number, since 4×222222121111221⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 222222121111191 and 222222121111200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222121111271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481000261915 + ... + 481000262376.

It is an arithmetic number, because the mean of its divisors is an integer number (23088012583008).

Almost surely, 2^{222222121111221} is an apocalyptic number.

222222121111221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222222121111221 is a deficient number, since it is larger than the sum of its proper divisors (147186080216907).

222222121111221 is a wasteful number, since it uses less digits than its factorization.

222222121111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962000524312.

The product of its digits is 512, while the sum is 24.

Adding to 222222121111221 its reverse (122111121222222), we get a palindrome (344333242333443).

The spelling of 222222121111221 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty-one".