21330311031 has 12 divisors (see below), whose sum is σ = 32432052120. Its totient is φ = 13471775280.

The previous prime is 21330310979. The next prime is 21330311053. The reversal of 21330311031 is 13011303312.

It is a happy number.

21330311031 is a `hidden beast` number, since 21 + 330 + 311 + 0 + 3 + 1 = 666.

It is not a de Polignac number, because 21330311031 - 2³¹ = 19182827383 is a prime.

It is a super-2 number, since 2×21330311031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21330310995 and 21330311013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330311231) 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 11 ways as a sum of consecutive naturals, for example, 62369160 + ... + 62369501.

It is an arithmetic number, because the mean of its divisors is an integer number (2702671010).

Almost surely, 2^21330311031 is an apocalyptic number.

21330311031 is a deficient number, since it is larger than the sum of its proper divisors (11101741089).

21330311031 is a wasteful number, since it uses less digits than its factorization.

21330311031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124738686 (or 124738683 counting only the distinct ones).

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

Adding to 21330311031 its reverse (13011303312), we get a palindrome (34341614343).

The spelling of 21330311031 in words is "twenty-one billion, three hundred thirty million, three hundred eleven thousand, thirty-one".