21031130331 has 16 divisors (see below), whose sum is σ = 31164545920. Its totient is φ = 14017461480.

The previous prime is 21031130327. The next prime is 21031130347. The reversal of 21031130331 is 13303113012.

It is a happy number.

21031130331 is a `hidden beast` number, since 21 + 0 + 311 + 3 + 0 + 331 = 666.

It is not a de Polignac number, because 21031130331 - 2² = 21031130327 is a prime.

It is a super-2 number, since 2×21031130331² (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 (21031130371) 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 15 ways as a sum of consecutive naturals, for example, 28536 + ... + 207066.

It is an arithmetic number, because the mean of its divisors is an integer number (1947784120).

Almost surely, 2^21031130331 is an apocalyptic number.

21031130331 is a deficient number, since it is larger than the sum of its proper divisors (10133415589).

21031130331 is a wasteful number, since it uses less digits than its factorization.

21031130331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182903 (or 182897 counting only the distinct ones).

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

Adding to 21031130331 its reverse (13303113012), we get a palindrome (34334243343).

The spelling of 21031130331 in words is "twenty-one billion, thirty-one million, one hundred thirty thousand, three hundred thirty-one".