21130142221 has 12 divisors (see below), whose sum is σ = 21851751456. Its totient is φ = 20431664760.

The previous prime is 21130142183. The next prime is 21130142249. The reversal of 21130142221 is 12224103112.

It is not a de Polignac number, because 21130142221 - 2⁷ = 21130142093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130142261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1247616 + ... + 1264438.

It is an arithmetic number, because the mean of its divisors is an integer number (1820979288).

Almost surely, 2^21130142221 is an apocalyptic number.

It is an amenable number.

21130142221 is a deficient number, since it is larger than the sum of its proper divisors (721609235).

21130142221 is a wasteful number, since it uses less digits than its factorization.

21130142221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18192 (or 18161 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21130142221 its reverse (12224103112), we get a palindrome (33354245333).

The spelling of 21130142221 in words is "twenty-one billion, one hundred thirty million, one hundred forty-two thousand, two hundred twenty-one".