13001001220 has 12 divisors (see below), whose sum is σ = 27302102604. Its totient is φ = 5200400480.

The previous prime is 13001001193. The next prime is 13001001257. The reversal of 13001001220 is 2210010031.

It can be written as a sum of positive squares in 2 ways, for example, as 1808630784 + 11192370436 = 42528^2 + 105794^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 13001001197 and 13001001206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325025011 + ... + 325025050.

It is an arithmetic number, because the mean of its divisors is an integer number (2275175217).

Almost surely, 2^13001001220 is an apocalyptic number.

13001001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13001001220 is an abundant number, since it is smaller than the sum of its proper divisors (14301101384).

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

13001001220 is a wasteful number, since it uses less digits than its factorization.

13001001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650050070 (or 650050068 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 13001001220 its reverse (2210010031), we get a palindrome (15211011251).

The spelling of 13001001220 in words is "thirteen billion, one million, one thousand, two hundred twenty".