1011311321 has 4 divisors (see below), whose sum is σ = 1011535632. Its totient is φ = 1011087012.

The previous prime is 1011311299. The next prime is 1011311341. The reversal of 1011311321 is 1231131101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011311321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1011311296 and 1011311305.

It is not an unprimeable number, because it can be changed into a prime (1011311341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105251 + ... + 114456.

It is an arithmetic number, because the mean of its divisors is an integer number (252883908).

Almost surely, 2^1011311321 is an apocalyptic number.

It is an amenable number.

1011311321 is a deficient number, since it is larger than the sum of its proper divisors (224311).

1011311321 is an equidigital number, since it uses as much as digits as its factorization.

1011311321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224310.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1011311321 is about 31801.1213795992. The cubic root of 1011311321 is about 1003.7563127806.

Adding to 1011311321 its reverse (1231131101), we get a palindrome (2242442422).

The spelling of 1011311321 in words is "one billion, eleven million, three hundred eleven thousand, three hundred twenty-one".