222112100111221 has 4 divisors (see below), whose sum is σ = 222896948521792. Its totient is φ = 221327251700652.

The previous prime is 222112100111179. The next prime is 222112100111267. The reversal of 222112100111221 is 122111001211222.

It is a happy number.

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 222112100111221 - 2¹⁹ = 222112099586933 is a prime.

It is a super-2 number, since 2×222112100111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222112100115221) 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, 392424204861 + ... + 392424205426.

It is an arithmetic number, because the mean of its divisors is an integer number (55724237130448).

Almost surely, 2^{222112100111221} is an apocalyptic number.

It is an amenable number.

222112100111221 is a deficient number, since it is larger than the sum of its proper divisors (784848410571).

222112100111221 is an equidigital number, since it uses as much as digits as its factorization.

222112100111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784848410570.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 222112100111221 its reverse (122111001211222), we get a palindrome (344223101322443).

The spelling of 222112100111221 in words is "two hundred twenty-two trillion, one hundred twelve billion, one hundred million, one hundred eleven thousand, two hundred twenty-one".