21131330031 has 32 divisors (see below), whose sum is σ = 35820825600. Its totient is φ = 12060563040.

The previous prime is 21131330029. The next prime is 21131330039. The reversal of 21131330031 is 13003313112.

It is a happy number.

21131330031 is a `hidden beast` number, since 21 + 1 + 313 + 300 + 31 = 666.

It is not a de Polignac number, because 21131330031 - 2¹ = 21131330029 is a prime.

It is a super-2 number, since 2×21131330031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21131329986 and 21131330013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131330039) 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 31 ways as a sum of consecutive naturals, for example, 91941 + ... + 225201.

It is an arithmetic number, because the mean of its divisors is an integer number (1119400800).

Almost surely, 2^21131330031 is an apocalyptic number.

21131330031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21131330031 is a deficient number, since it is larger than the sum of its proper divisors (14689495569).

21131330031 is a wasteful number, since it uses less digits than its factorization.

21131330031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134116 (or 134110 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21131330031 its reverse (13003313112), we get a palindrome (34134643143).

The spelling of 21131330031 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirty thousand, thirty-one".