13121010223220 has 48 divisors (see below), whose sum is σ = 27809950568400. Its totient is φ = 5199685263360.

The previous prime is 13121010223199. The next prime is 13121010223229. The reversal of 13121010223220 is 2232201012131.

It can be written as a sum of positive squares in 8 ways, for example, as 4448479976164 + 8672530247056 = 2109142^2 + 2944916^2 .

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 = 13121010223192 and 13121010223201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121010223229) 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, 19908326 + ... + 20556834.

It is an arithmetic number, because the mean of its divisors is an integer number (579373970175).

Almost surely, 2^{13121010223220} is an apocalyptic number.

13121010223220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121010223220 is an abundant number, since it is smaller than the sum of its proper divisors (14688940345180).

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

13121010223220 is a wasteful number, since it uses less digits than its factorization.

13121010223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657908 (or 657906 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 13121010223220 its reverse (2232201012131), we get a palindrome (15353211235351).

The spelling of 13121010223220 in words is "thirteen trillion, one hundred twenty-one billion, ten million, two hundred twenty-three thousand, two hundred twenty".