11222001221 has 2 divisors, whose sum is σ = 11222001222. Its totient is φ = 11222001220.

The previous prime is 11222001199. The next prime is 11222001233. The reversal of 11222001221 is 12210022211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10917324196 + 304677025 = 104486^2 + 17455^2 .

It is a cyclic number.

It is not a de Polignac number, because 11222001221 - 2⁶ = 11222001157 is a prime.

It is a super-2 number, since 2×11222001221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11222001196 and 11222001205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11222001281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5611000610 + 5611000611.

It is an arithmetic number, because the mean of its divisors is an integer number (5611000611).

Almost surely, 2^11222001221 is an apocalyptic number.

It is an amenable number.

11222001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11222001221 is an equidigital number, since it uses as much as digits as its factorization.

11222001221 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 14.

Adding to 11222001221 its reverse (12210022211), we get a palindrome (23432023432).

The spelling of 11222001221 in words is "eleven billion, two hundred twenty-two million, one thousand, two hundred twenty-one".