13021223121 has 10 divisors (see below), whose sum is σ = 19451456882. Its totient is φ = 8680815360.

The previous prime is 13021223107. The next prime is 13021223129. The reversal of 13021223121 is 12132212031.

It can be written as a sum of positive squares in only one way, i.e., 10416243600 + 2604979521 = 102060^2 + 51039^2 .

It is not a de Polignac number, because 13021223121 - 2⁷ = 13021222993 is a prime.

It is a super-3 number, since 3×13021223121³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13021223094 and 13021223103.

It is not an unprimeable number, because it can be changed into a prime (13021223129) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 80377840 + ... + 80378001.

Almost surely, 2^13021223121 is an apocalyptic number.

It is an amenable number.

13021223121 is a deficient number, since it is larger than the sum of its proper divisors (6430233761).

13021223121 is an equidigital number, since it uses as much as digits as its factorization.

13021223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160755853 (or 160755844 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 13021223121 its reverse (12132212031), we get a palindrome (25153435152).

The spelling of 13021223121 in words is "thirteen billion, twenty-one million, two hundred twenty-three thousand, one hundred twenty-one".