21330031031 has 8 divisors (see below), whose sum is σ = 21360562944. Its totient is φ = 21299523840.

The previous prime is 21330030983. The next prime is 21330031039. The reversal of 21330031031 is 13013003312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21330031031 is a prime.

It is a super-2 number, since 2×21330031031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330031039) 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 7 ways as a sum of consecutive naturals, for example, 2279795 + ... + 2289131.

It is an arithmetic number, because the mean of its divisors is an integer number (2670070368).

Almost surely, 2^21330031031 is an apocalyptic number.

21330031031 is a deficient number, since it is larger than the sum of its proper divisors (30531913).

21330031031 is a wasteful number, since it uses less digits than its factorization.

21330031031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12361.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21330031031 its reverse (13013003312), we get a palindrome (34343034343).

The spelling of 21330031031 in words is "twenty-one billion, three hundred thirty million, thirty-one thousand, thirty-one".