13213221021 has 96 divisors (see below), whose sum is σ = 26110086912. Its totient is φ = 6216238080.

The previous prime is 13213221011. The next prime is 13213221031. The reversal of 13213221021 is 12012231231.

13213221021 is a `hidden beast` number, since 1 + 321 + 322 + 1 + 0 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (13213221011) and next prime (13213221031).

It is not a de Polignac number, because 13213221021 - 2⁵ = 13213220989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13213220985 and 13213221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13213221011) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 463641 + ... + 491313.

It is an arithmetic number, because the mean of its divisors is an integer number (271980072).

Almost surely, 2^13213221021 is an apocalyptic number.

13213221021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13213221021 is a deficient number, since it is larger than the sum of its proper divisors (12896865891).

13213221021 is a wasteful number, since it uses less digits than its factorization.

13213221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27763 (or 27760 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 13213221021 its reverse (12012231231), we get a palindrome (25225452252).

The spelling of 13213221021 in words is "thirteen billion, two hundred thirteen million, two hundred twenty-one thousand, twenty-one".