21331122131 has 4 divisors (see below), whose sum is σ = 23270315064. Its totient is φ = 19391929200.

The previous prime is 21331122073. The next prime is 21331122143. The reversal of 21331122131 is 13122113312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21331122131 - 2¹⁸ = 21330859987 is a prime.

It is a super-2 number, since 2×21331122131² (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 (21331122151) 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 3 ways as a sum of consecutive naturals, for example, 969596450 + ... + 969596471.

It is an arithmetic number, because the mean of its divisors is an integer number (5817578766).

Almost surely, 2^21331122131 is an apocalyptic number.

21331122131 is a deficient number, since it is larger than the sum of its proper divisors (1939192933).

21331122131 is a wasteful number, since it uses less digits than its factorization.

21331122131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939192932.

The product of its digits is 216, while the sum is 20.

Adding to 21331122131 its reverse (13122113312), we get a palindrome (34453235443).

The spelling of 21331122131 in words is "twenty-one billion, three hundred thirty-one million, one hundred twenty-two thousand, one hundred thirty-one".