22211110001221 has 2 divisors, whose sum is σ = 22211110001222. Its totient is φ = 22211110001220.

The previous prime is 22211110001219. The next prime is 22211110001257. The reversal of 22211110001221 is 12210001111222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22203603684900 + 7506316321 = 4712070^2 + 86639^2 .

It is a cyclic number.

It is not a de Polignac number, because 22211110001221 - 2¹ = 22211110001219 is a prime.

Together with 22211110001219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22211110001195 and 22211110001204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22211110001291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11105555000610 + 11105555000611.

It is an arithmetic number, because the mean of its divisors is an integer number (11105555000611).

Almost surely, 2^{22211110001221} is an apocalyptic number.

It is an amenable number.

22211110001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22211110001221 is an equidigital number, since it uses as much as digits as its factorization.

22211110001221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 22211110001221 its reverse (12210001111222), we get a palindrome (34421111112443).

The spelling of 22211110001221 in words is "twenty-two trillion, two hundred eleven billion, one hundred ten million, one thousand, two hundred twenty-one".