1122212220221 has 4 divisors (see below), whose sum is σ = 1122214346844. Its totient is φ = 1122210093600.

The previous prime is 1122212220209. The next prime is 1122212220347. The reversal of 1122212220221 is 1220222122211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 458174656996 + 664037563225 = 676886^2 + 814885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1122212220221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1122212220193 and 1122212220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122212220821) 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, 394031 + ... + 1549091.

It is an arithmetic number, because the mean of its divisors is an integer number (280553586711).

Almost surely, 2^{1122212220221} is an apocalyptic number.

It is an amenable number.

1122212220221 is a deficient number, since it is larger than the sum of its proper divisors (2126623).

1122212220221 is an equidigital number, since it uses as much as digits as its factorization.

1122212220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126622.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1122212220221 its reverse (1220222122211), we get a palindrome (2342434342432).

The spelling of 1122212220221 in words is "one trillion, one hundred twenty-two billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty-one".