222121111109 has 2 divisors, whose sum is σ = 222121111110. Its totient is φ = 222121111108.

The previous prime is 222121111081. The next prime is 222121111153. The reversal of 222121111109 is 901111121222.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162106890625 + 60014220484 = 402625^2 + 244978^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121111109 - 2⁸ = 222121110853 is a prime.

It is a super-4 number, since 4×222121111109⁴ (a number of 46 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222121111159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060555554 + 111060555555.

It is an arithmetic number, because the mean of its divisors is an integer number (111060555555).

Almost surely, 2^222121111109 is an apocalyptic number.

It is an amenable number.

222121111109 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121111109 is an equidigital number, since it uses as much as digits as its factorization.

222121111109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 222121111109 in words is "two hundred twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, one hundred nine".