1121521111 has 2 divisors, whose sum is σ = 1121521112. Its totient is φ = 1121521110.

The previous prime is 1121521109. The next prime is 1121521133. The reversal of 1121521111 is 1111251211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1121521111 - 2¹ = 1121521109 is a prime.

Together with 1121521109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121521811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560760555 + 560760556.

It is an arithmetic number, because the mean of its divisors is an integer number (560760556).

Almost surely, 2^1121521111 is an apocalyptic number.

1121521111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121521111 is an equidigital number, since it uses as much as digits as its factorization.

1121521111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20, while the sum is 16.

The square root of 1121521111 is about 33489.1192926897. The cubic root of 1121521111 is about 1038.9687481626.

Adding to 1121521111 its reverse (1111251211), we get a palindrome (2232772322).

The spelling of 1121521111 in words is "one billion, one hundred twenty-one million, five hundred twenty-one thousand, one hundred eleven".