11321020811 has 2 divisors, whose sum is σ = 11321020812. Its totient is φ = 11321020810.

The previous prime is 11321020807. The next prime is 11321020847. The reversal of 11321020811 is 11802012311.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11321020811 - 2² = 11321020807 is a prime.

It is not a weakly prime, because it can be changed into another prime (11321020891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5660510405 + 5660510406.

It is an arithmetic number, because the mean of its divisors is an integer number (5660510406).

Almost surely, 2^11321020811 is an apocalyptic number.

11321020811 is a deficient number, since it is larger than the sum of its proper divisors (1).

11321020811 is an equidigital number, since it uses as much as digits as its factorization.

11321020811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

The spelling of 11321020811 in words is "eleven billion, three hundred twenty-one million, twenty thousand, eight hundred eleven".