21133310031 has 12 divisors (see below), whose sum is σ = 30536873640. Its totient is φ = 14083805040.

The previous prime is 21133310027. The next prime is 21133310083. The reversal of 21133310031 is 13001333112.

It is a happy number.

It is not a de Polignac number, because 21133310031 - 2² = 21133310027 is a prime.

It is a super-2 number, since 2×21133310031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21133309986 and 21133310013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133310021) 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 11 ways as a sum of consecutive naturals, for example, 395865 + ... + 446066.

It is an arithmetic number, because the mean of its divisors is an integer number (2544739470).

Almost surely, 2^21133310031 is an apocalyptic number.

21133310031 is a deficient number, since it is larger than the sum of its proper divisors (9403563609).

21133310031 is a wasteful number, since it uses less digits than its factorization.

21133310031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844726 (or 844723 counting only the distinct ones).

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

Adding to 21133310031 its reverse (13001333112), we get a palindrome (34134643143).

The spelling of 21133310031 in words is "twenty-one billion, one hundred thirty-three million, three hundred ten thousand, thirty-one".