222222212101 has 4 divisors (see below), whose sum is σ = 222240144204. Its totient is φ = 222204280000.

The previous prime is 222222212087. The next prime is 222222212159. The reversal of 222222212101 is 101212222222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101212222222 = 2 ⋅50606111111.

It can be written as a sum of positive squares in 2 ways, for example, as 140197824900 + 82024387201 = 374430^2 + 286399^2 .

It is a cyclic number.

It is not a de Polignac number, because 222222212101 - 2¹³ = 222222203909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222312101) 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, 8947450 + ... + 8972251.

It is an arithmetic number, because the mean of its divisors is an integer number (55560036051).

Almost surely, 2^222222212101 is an apocalyptic number.

It is an amenable number.

222222212101 is a deficient number, since it is larger than the sum of its proper divisors (17932103).

222222212101 is a wasteful number, since it uses less digits than its factorization.

222222212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17932102.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 222222212101 its reverse (101212222222), we get a palindrome (323434434323).

The spelling of 222222212101 in words is "two hundred twenty-two billion, two hundred twenty-two million, two hundred twelve thousand, one hundred one".