21221321131 has 8 divisors (see below), whose sum is σ = 21583998000. Its totient is φ = 20858744160.

The previous prime is 21221321129. The next prime is 21221321161. The reversal of 21221321131 is 13112312212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221321131 - 2¹ = 21221321129 is a prime.

It is a super-2 number, since 2×21221321131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221321099 and 21221321108.

It is not an unprimeable number, because it can be changed into a prime (21221321101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495145 + ... + 536293.

It is an arithmetic number, because the mean of its divisors is an integer number (2697999750).

Almost surely, 2^21221321131 is an apocalyptic number.

21221321131 is a deficient number, since it is larger than the sum of its proper divisors (362676869).

21221321131 is an equidigital number, since it uses as much as digits as its factorization.

21221321131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49949.

The product of its digits is 144, while the sum is 19.

Adding to 21221321131 its reverse (13112312212), we get a palindrome (34333633343).

The spelling of 21221321131 in words is "twenty-one billion, two hundred twenty-one million, three hundred twenty-one thousand, one hundred thirty-one".