21331303131 has 16 divisors (see below), whose sum is σ = 29114539520. Its totient is φ = 13884726240.

The previous prime is 21331303099. The next prime is 21331303139. The reversal of 21331303131 is 13130313312.

It is not a de Polignac number, because 21331303131 - 2⁵ = 21331303099 is a prime.

It is a super-2 number, since 2×21331303131² (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 = 21331303098 and 21331303107.

It is not an unprimeable number, because it can be changed into a prime (21331303139) 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 15 ways as a sum of consecutive naturals, for example, 313605 + ... + 375513.

It is an arithmetic number, because the mean of its divisors is an integer number (1819658720).

Almost surely, 2^21331303131 is an apocalyptic number.

21331303131 is a deficient number, since it is larger than the sum of its proper divisors (7783236389).

21331303131 is a wasteful number, since it uses less digits than its factorization.

21331303131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64626.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 21331303131 its reverse (13130313312), we get a palindrome (34461616443).

The spelling of 21331303131 in words is "twenty-one billion, three hundred thirty-one million, three hundred three thousand, one hundred thirty-one".