20111011 has 2 divisors, whose sum is σ = 20111012. Its totient is φ = 20111010.

The previous prime is 20110997. The next prime is 20111023. The reversal of 20111011 is 11011102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20110985 and 20111003.

It is not a weakly prime, because it can be changed into another prime (20111071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055505 + 10055506.

It is an arithmetic number, because the mean of its divisors is an integer number (10055506).

Almost surely, 2^20111011 is an apocalyptic number.

20111011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111011 is an equidigital number, since it uses as much as digits as its factorization.

20111011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 20111011 is about 4484.5301872103. The cubic root of 20111011 is about 271.9430523441.

Adding to 20111011 its reverse (11011102), we get a palindrome (31122113).

Subtracting from 20111011 its reverse (11011102), we obtain a palindrome (9099909).

Multiplying 20111011 by its reverse (11011102), we get a palindrome (221444393444122).

It can be divided in two parts, 2011101 and 1, that added together give a palindrome (2011102).

The spelling of 20111011 in words is "twenty million, one hundred eleven thousand, eleven".