21223012131 has 24 divisors (see below), whose sum is σ = 30813610256. Its totient is φ = 14075804160.

The previous prime is 21223012093. The next prime is 21223012159. The reversal of 21223012131 is 13121032212.

It is not a de Polignac number, because 21223012131 - 2⁶ = 21223012067 is a prime.

It is a super-2 number, since 2×21223012131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223012831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2431431 + ... + 2440143.

Almost surely, 2^21223012131 is an apocalyptic number.

21223012131 is a deficient number, since it is larger than the sum of its proper divisors (9590598125).

21223012131 is a wasteful number, since it uses less digits than its factorization.

21223012131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10083 (or 10080 counting only the distinct ones).

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

Adding to 21223012131 its reverse (13121032212), we get a palindrome (34344044343).

The spelling of 21223012131 in words is "twenty-one billion, two hundred twenty-three million, twelve thousand, one hundred thirty-one".