11211321321 has 16 divisors (see below), whose sum is σ = 16611073920. Its totient is φ = 7473445200.

The previous prime is 11211321269. The next prime is 11211321353. The reversal of 11211321321 is 12312311211.

11211321321 is a `hidden beast` number, since 1 + 1 + 21 + 1 + 321 + 321 = 666.

It is not a de Polignac number, because 11211321321 - 2⁶ = 11211321257 is a prime.

It is a super-4 number, since 4×11211321321⁴ (a number of 41 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11211321294 and 11211321303.

It is not an unprimeable number, because it can be changed into a prime (11211321361) 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, 389791 + ... + 417563.

It is an arithmetic number, because the mean of its divisors is an integer number (1038192120).

Almost surely, 2^11211321321 is an apocalyptic number.

It is an amenable number.

11211321321 is a deficient number, since it is larger than the sum of its proper divisors (5399752599).

11211321321 is a wasteful number, since it uses less digits than its factorization.

11211321321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42733 (or 42727 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11211321321 its reverse (12312311211), we get a palindrome (23523632532).

The spelling of 11211321321 in words is "eleven billion, two hundred eleven million, three hundred twenty-one thousand, three hundred twenty-one".