1321101111 has 12 divisors (see below), whose sum is σ = 1936159736. Its totient is φ = 800667120.

The previous prime is 1321101091. The next prime is 1321101113. The reversal of 1321101111 is 1111011231.

It is not a de Polignac number, because 1321101111 - 2¹⁰ = 1321100087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321101113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1819336 + ... + 1820061.

Almost surely, 2^1321101111 is an apocalyptic number.

1321101111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1321101111 is a deficient number, since it is larger than the sum of its proper divisors (615058625).

1321101111 is a wasteful number, since it uses less digits than its factorization.

1321101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3639422 (or 3639411 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 12.

The square root of 1321101111 is about 36346.9546317157. The cubic root of 1321101111 is about 1097.2662449464.

Adding to 1321101111 its reverse (1111011231), we get a palindrome (2432112342).

The spelling of 1321101111 in words is "one billion, three hundred twenty-one million, one hundred one thousand, one hundred eleven".