13220111021 has 12 divisors (see below), whose sum is σ = 14585377428. Its totient is φ = 11972922624.

The previous prime is 13220111017. The next prime is 13220111027. The reversal of 13220111021 is 12011102231.

It can be written as a sum of positive squares in 6 ways, for example, as 768675625 + 12451435396 = 27725^2 + 111586^2 .

It is not a de Polignac number, because 13220111021 - 2² = 13220111017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13220110987 and 13220111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220111027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 729020 + ... + 746933.

It is an arithmetic number, because the mean of its divisors is an integer number (1215448119).

Almost surely, 2^13220111021 is an apocalyptic number.

It is an amenable number.

13220111021 is a deficient number, since it is larger than the sum of its proper divisors (1365266407).

13220111021 is a wasteful number, since it uses less digits than its factorization.

13220111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476032 (or 1476019 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 13220111021 its reverse (12011102231), we get a palindrome (25231213252).

The spelling of 13220111021 in words is "thirteen billion, two hundred twenty million, one hundred eleven thousand, twenty-one".