22101011221 has 2 divisors, whose sum is σ = 22101011222. Its totient is φ = 22101011220.

The previous prime is 22101011209. The next prime is 22101011227. The reversal of 22101011221 is 12211010122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21320088196 + 780923025 = 146014^2 + 27945^2 .

It is a cyclic number.

It is not a de Polignac number, because 22101011221 - 2¹⁷ = 22100880149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22101011227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11050505610 + 11050505611.

It is an arithmetic number, because the mean of its divisors is an integer number (11050505611).

Almost surely, 2^22101011221 is an apocalyptic number.

It is an amenable number.

22101011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22101011221 is an equidigital number, since it uses as much as digits as its factorization.

22101011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 22101011221 its reverse (12211010122), we get a palindrome (34312021343).

The spelling of 22101011221 in words is "twenty-two billion, one hundred one million, eleven thousand, two hundred twenty-one".