13220421331 has 16 divisors (see below), whose sum is σ = 15868288800. Its totient is φ = 10881105408.

The previous prime is 13220421329. The next prime is 13220421343. The reversal of 13220421331 is 13312402231.

It is not a de Polignac number, because 13220421331 - 2¹ = 13220421329 is a prime.

It is a super-2 number, since 2×13220421331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13220421301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1570036 + ... + 1578433.

It is an arithmetic number, because the mean of its divisors is an integer number (991768050).

Almost surely, 2^13220421331 is an apocalyptic number.

13220421331 is a deficient number, since it is larger than the sum of its proper divisors (2647867469).

13220421331 is a wasteful number, since it uses less digits than its factorization.

13220421331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3148518.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 13220421331 its reverse (13312402231), we get a palindrome (26532823562).

The spelling of 13220421331 in words is "thirteen billion, two hundred twenty million, four hundred twenty-one thousand, three hundred thirty-one".