13121012320220 has 48 divisors (see below), whose sum is σ = 31490917129728. Its totient is φ = 4498563144000.

The previous prime is 13121012320201. The next prime is 13121012320231. The reversal of 13121012320220 is 2202321012131.

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 = 13121012320192 and 13121012320201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8793479 + ... + 10176801.

It is an arithmetic number, because the mean of its divisors is an integer number (656060773536).

Almost surely, 2^{13121012320220} is an apocalyptic number.

13121012320220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121012320220 is an abundant number, since it is smaller than the sum of its proper divisors (18369904809508).

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

13121012320220 is a wasteful number, since it uses less digits than its factorization.

13121012320220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451090 (or 1451088 counting only the distinct ones).

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

Adding to 13121012320220 its reverse (2202321012131), we get a palindrome (15323333332351).

The spelling of 13121012320220 in words is "thirteen trillion, one hundred twenty-one billion, twelve million, three hundred twenty thousand, two hundred twenty".