11021111123221 has 2 divisors, whose sum is σ = 11021111123222. Its totient is φ = 11021111123220.

The previous prime is 11021111123213. The next prime is 11021111123237. The reversal of 11021111123221 is 12232111112011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8756805456100 + 2264305667121 = 2959190^2 + 1504761^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021111123221 - 2³ = 11021111123213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021111123251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510555561610 + 5510555561611.

It is an arithmetic number, because the mean of its divisors is an integer number (5510555561611).

Almost surely, 2^{11021111123221} is an apocalyptic number.

It is an amenable number.

11021111123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021111123221 is an equidigital number, since it uses as much as digits as its factorization.

11021111123221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 11021111123221 its reverse (12232111112011), we get a palindrome (23253222235232).

The spelling of 11021111123221 in words is "eleven trillion, twenty-one billion, one hundred eleven million, one hundred twenty-three thousand, two hundred twenty-one".