13221021020 has 12 divisors (see below), whose sum is σ = 27764144184. Its totient is φ = 5288408400.

The previous prime is 13221021017. The next prime is 13221021049. The reversal of 13221021020 is 2012012231.

It is a happy number.

It is a super-2 number, since 2×13221021020² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13221020986 and 13221021004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330525506 + ... + 330525545.

It is an arithmetic number, because the mean of its divisors is an integer number (2313678682).

Almost surely, 2^13221021020 is an apocalyptic number.

13221021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13221021020 is an abundant number, since it is smaller than the sum of its proper divisors (14543123164).

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

13221021020 is a wasteful number, since it uses less digits than its factorization.

13221021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661051060 (or 661051058 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 13221021020 its reverse (2012012231), we get a palindrome (15233033251).

The spelling of 13221021020 in words is "thirteen billion, two hundred twenty-one million, twenty-one thousand, twenty".