22220202021221 has 2 divisors, whose sum is σ = 22220202021222. Its totient is φ = 22220202021220.

The previous prime is 22220202021211. The next prime is 22220202021239. The reversal of 22220202021221 is 12212020202222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21054460728196 + 1165741293025 = 4588514^2 + 1079695^2 .

It is a cyclic number.

It is not a de Polignac number, because 22220202021221 - 2¹⁴ = 22220202004837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22220202021193 and 22220202021202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22220202021211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110101010610 + 11110101010611.

It is an arithmetic number, because the mean of its divisors is an integer number (11110101010611).

Almost surely, 2^{22220202021221} is an apocalyptic number.

It is an amenable number.

22220202021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22220202021221 is an equidigital number, since it uses as much as digits as its factorization.

22220202021221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 22220202021221 its reverse (12212020202222), we get a palindrome (34432222223443).

The spelling of 22220202021221 in words is "twenty-two trillion, two hundred twenty billion, two hundred two million, twenty-one thousand, two hundred twenty-one".