11320420511 has 4 divisors (see below), whose sum is σ = 11321605800. Its totient is φ = 11319235224.

The previous prime is 11320420493. The next prime is 11320420519. The reversal of 11320420511 is 11502402311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11320420511 is a prime.

It is a super-2 number, since 2×11320420511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11320420519) 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, 578201 + ... + 597458.

It is an arithmetic number, because the mean of its divisors is an integer number (2830401450).

Almost surely, 2^11320420511 is an apocalyptic number.

11320420511 is a deficient number, since it is larger than the sum of its proper divisors (1185289).

11320420511 is an equidigital number, since it uses as much as digits as its factorization.

11320420511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185288.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 11320420511 its reverse (11502402311), we get a palindrome (22822822822).

The spelling of 11320420511 in words is "eleven billion, three hundred twenty million, four hundred twenty thousand, five hundred eleven".