13120311021 has 4 divisors (see below), whose sum is σ = 17493748032. Its totient is φ = 8746874012.

The previous prime is 13120311007. The next prime is 13120311031. The reversal of 13120311021 is 12011302131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13120311021 - 2¹¹ = 13120308973 is a prime.

It is a super-2 number, since 2×13120311021² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13120311031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2186718501 + ... + 2186718506.

It is an arithmetic number, because the mean of its divisors is an integer number (4373437008).

Almost surely, 2^13120311021 is an apocalyptic number.

It is an amenable number.

13120311021 is a deficient number, since it is larger than the sum of its proper divisors (4373437011).

13120311021 is an equidigital number, since it uses as much as digits as its factorization.

13120311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4373437010.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 13120311021 its reverse (12011302131), we get a palindrome (25131613152).

The spelling of 13120311021 in words is "thirteen billion, one hundred twenty million, three hundred eleven thousand, twenty-one".