21331022131 has 16 divisors (see below), whose sum is σ = 21648897088. Its totient is φ = 21016195200.

The previous prime is 21331022093. The next prime is 21331022137. The reversal of 21331022131 is 13122013312.

It is a cyclic number.

It is not a de Polignac number, because 21331022131 - 2¹⁵ = 21330989363 is a prime.

It is a super-2 number, since 2×21331022131² (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 = 21331022099 and 21331022108.

It is not an unprimeable number, because it can be changed into a prime (21331022137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11962666 + ... + 11964448.

It is an arithmetic number, because the mean of its divisors is an integer number (1353056068).

Almost surely, 2^21331022131 is an apocalyptic number.

21331022131 is a deficient number, since it is larger than the sum of its proper divisors (317874957).

21331022131 is a wasteful number, since it uses less digits than its factorization.

21331022131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2542.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21331022131 its reverse (13122013312), we get a palindrome (34453035443).

The spelling of 21331022131 in words is "twenty-one billion, three hundred thirty-one million, twenty-two thousand, one hundred thirty-one".