20112221011 has 2 divisors, whose sum is σ = 20112221012. Its totient is φ = 20112221010.

The previous prime is 20112220939. The next prime is 20112221099. The reversal of 20112221011 is 11012221102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20112221011 - 2⁷ = 20112220883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20112220982 and 20112221000.

It is not a weakly prime, because it can be changed into another prime (20112261011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056110505 + 10056110506.

It is an arithmetic number, because the mean of its divisors is an integer number (10056110506).

Almost surely, 2^20112221011 is an apocalyptic number.

20112221011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112221011 is an equidigital number, since it uses as much as digits as its factorization.

20112221011 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 20112221011 its reverse (11012221102), we get a palindrome (31124442113).

Subtracting from 20112221011 its reverse (11012221102), we obtain a palindrome (9099999909).

The spelling of 20112221011 in words is "twenty billion, one hundred twelve million, two hundred twenty-one thousand, eleven".