11021222220221 has 4 divisors (see below), whose sum is σ = 11022409733244. Its totient is φ = 11020034707200.

The previous prime is 11021222220209. The next prime is 11021222220223. The reversal of 11021222220221 is 12202222212011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3966514375321 + 7054707844900 = 1991611^2 + 2656070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11021222220221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11021222220193 and 11021222220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021222220223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 593742590 + ... + 593761151.

It is an arithmetic number, because the mean of its divisors is an integer number (2755602433311).

Almost surely, 2^{11021222220221} is an apocalyptic number.

It is an amenable number.

11021222220221 is a deficient number, since it is larger than the sum of its proper divisors (1187513023).

11021222220221 is an equidigital number, since it uses as much as digits as its factorization.

11021222220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187513022.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 11021222220221 its reverse (12202222212011), we get a palindrome (23223444432232).

The spelling of 11021222220221 in words is "eleven trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".