11211023111 has 2 divisors, whose sum is σ = 11211023112. Its totient is φ = 11211023110.

The previous prime is 11211023069. The next prime is 11211023143. The reversal of 11211023111 is 11132011211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11211023111 is a prime.

It is a super-2 number, since 2×11211023111² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211023191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605511555 + 5605511556.

It is an arithmetic number, because the mean of its divisors is an integer number (5605511556).

Almost surely, 2^11211023111 is an apocalyptic number.

11211023111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211023111 is an equidigital number, since it uses as much as digits as its factorization.

11211023111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 11211023111 its reverse (11132011211), we get a palindrome (22343034322).

The spelling of 11211023111 in words is "eleven billion, two hundred eleven million, twenty-three thousand, one hundred eleven".