13321222020 has 72 divisors (see below), whose sum is σ = 40420238040. Its totient is φ = 3551224320.

The previous prime is 13321222001. The next prime is 13321222021. The reversal of 13321222020 is 2022212331.

It can be written as a sum of positive squares in 4 ways, for example, as 6111174276 + 7210047744 = 78174^2 + 84912^2 .

It is a super-2 number, since 2×13321222020² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 13321221984 and 13321222002.

It is not an unprimeable number, because it can be changed into a prime (13321222021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 689046 + ... + 708114.

It is an arithmetic number, because the mean of its divisors is an integer number (561392195).

Almost surely, 2^13321222020 is an apocalyptic number.

13321222020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13321222020 is an abundant number, since it is smaller than the sum of its proper divisors (27099016020).

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

13321222020 is a wasteful number, since it uses less digits than its factorization.

13321222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22965 (or 22960 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 13321222020 its reverse (2022212331), we get a palindrome (15343434351).

The spelling of 13321222020 in words is "thirteen billion, three hundred twenty-one million, two hundred twenty-two thousand, twenty".