13123221020 has 48 divisors (see below), whose sum is σ = 33918483648. Its totient is φ = 4153282560.

The previous prime is 13123221019. The next prime is 13123221049. The reversal of 13123221020 is 2012232131.

It is a self number, because there is not a number n which added to its sum of digits gives 13123221020.

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, 3603461 + ... + 3607100.

It is an arithmetic number, because the mean of its divisors is an integer number (706635076).

Almost surely, 2^13123221020 is an apocalyptic number.

13123221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13123221020 is an abundant number, since it is smaller than the sum of its proper divisors (20795262628).

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

13123221020 is a wasteful number, since it uses less digits than its factorization.

13123221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7210590 (or 7210588 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 13123221020 its reverse (2012232131), we get a palindrome (15135453151).

The spelling of 13123221020 in words is "thirteen billion, one hundred twenty-three million, two hundred twenty-one thousand, twenty".