11311321020 has 24 divisors (see below), whose sum is σ = 31671699024. Its totient is φ = 3016352256.

The previous prime is 11311321001. The next prime is 11311321079. The reversal of 11311321020 is 2012311311.

It is a happy number.

11311321020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94260949 + ... + 94261068.

It is an arithmetic number, because the mean of its divisors is an integer number (1319654126).

Almost surely, 2^11311321020 is an apocalyptic number.

11311321020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11311321020 is an abundant number, since it is smaller than the sum of its proper divisors (20360378004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11311321020 is a wasteful number, since it uses less digits than its factorization.

11311321020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188522029 (or 188522027 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 11311321020 its reverse (2012311311), we get a palindrome (13323632331).

The spelling of 11311321020 in words is "eleven billion, three hundred eleven million, three hundred twenty-one thousand, twenty".