13320021031220 has 24 divisors (see below), whose sum is σ = 27972240875208. Its totient is φ = 5327970944000.

The previous prime is 13320021031199. The next prime is 13320021031223. The reversal of 13320021031220 is 2213012002331.

It can be written as a sum of positive squares in 4 ways, for example, as 2690295404944 + 10629725626276 = 1640212^2 + 3260326^2 .

It is a super-2 number, since 2×13320021031220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 13320021031192 and 13320021031201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13320021031223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667640 + ... + 5204400.

It is an arithmetic number, because the mean of its divisors is an integer number (1165510036467).

Almost surely, 2^{13320021031220} is an apocalyptic number.

13320021031220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13320021031220 is an abundant number, since it is smaller than the sum of its proper divisors (14652219843988).

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

13320021031220 is a wasteful number, since it uses less digits than its factorization.

13320021031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4683571 (or 4683569 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 13320021031220 its reverse (2213012002331), we get a palindrome (15533033033551).

The spelling of 13320021031220 in words is "thirteen trillion, three hundred twenty billion, twenty-one million, thirty-one thousand, two hundred twenty".