13128311220 has 48 divisors (see below), whose sum is σ = 38357504640. Its totient is φ = 3348670336.

The previous prime is 13128311219. The next prime is 13128311293. The reversal of 13128311220 is 2211382131.

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 15 ways as a sum of consecutive naturals, for example, 4755255 + ... + 4758014.

It is an arithmetic number, because the mean of its divisors is an integer number (799114680).

Almost surely, 2^13128311220 is an apocalyptic number.

13128311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13128311220 is an abundant number, since it is smaller than the sum of its proper divisors (25229193420).

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

13128311220 is a wasteful number, since it uses less digits than its factorization.

13128311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9513304 (or 9513302 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 13128311220 its reverse (2211382131), we get a palindrome (15339693351).

The spelling of 13128311220 in words is "thirteen billion, one hundred twenty-eight million, three hundred eleven thousand, two hundred twenty".