1211001022228 has 12 divisors (see below), whose sum is σ = 2119260232180. Its totient is φ = 605498098752.

The previous prime is 1211001022159. The next prime is 1211001022229. The reversal of 1211001022228 is 8222201001121.

It can be written as a sum of positive squares in 2 ways, for example, as 261491095044 + 949509927184 = 511362^2 + 974428^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1211001022199 and 1211001022208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211001022229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999688 + ... + 1849696.

Almost surely, 2^{1211001022228} is an apocalyptic number.

It is an amenable number.

1211001022228 is a deficient number, since it is larger than the sum of its proper divisors (908259209952).

1211001022228 is a wasteful number, since it uses less digits than its factorization.

1211001022228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206186 (or 1206184 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 1211001022228 its reverse (8222201001121), we get a palindrome (9433202023349).

The spelling of 1211001022228 in words is "one trillion, two hundred eleven billion, one million, twenty-two thousand, two hundred twenty-eight".