1321011111 has 16 divisors (see below), whose sum is σ = 2067375104. Its totient is φ = 734461344.

The previous prime is 1321011101. The next prime is 1321011149. The reversal of 1321011111 is 1111101231.

It is not a de Polignac number, because 1321011111 - 2⁵ = 1321011079 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 (1321011101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 849295 + ... + 850848.

It is an arithmetic number, because the mean of its divisors is an integer number (129210944).

Almost surely, 2^1321011111 is an apocalyptic number.

1321011111 is a deficient number, since it is larger than the sum of its proper divisors (746363993).

1321011111 is a wasteful number, since it uses less digits than its factorization.

1321011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700190.

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

The square root of 1321011111 is about 36345.7165426684. The cubic root of 1321011111 is about 1097.2413272966.

Adding to 1321011111 its reverse (1111101231), we get a palindrome (2432112342).

The spelling of 1321011111 in words is "one billion, three hundred twenty-one million, eleven thousand, one hundred eleven".