31003100021 has 8 divisors (see below), whose sum is σ = 31281344640. Its totient is φ = 30724923712.

The previous prime is 31003100017. The next prime is 31003100041. The reversal of 31003100021 is 12000130013.

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

It is a cyclic number.

It is not a de Polignac number, because 31003100021 - 2² = 31003100017 is a prime.

It is a super-2 number, since 2×31003100021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31003099975 and 31003100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31003100041) 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, 1470170 + ... + 1491108.

It is an arithmetic number, because the mean of its divisors is an integer number (3910168080).

Almost surely, 2^31003100021 is an apocalyptic number.

It is an amenable number.

31003100021 is a deficient number, since it is larger than the sum of its proper divisors (278244619).

31003100021 is a wasteful number, since it uses less digits than its factorization.

31003100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34155.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 31003100021 its reverse (12000130013), we get a palindrome (43003230034).

The spelling of 31003100021 in words is "thirty-one billion, three million, one hundred thousand, twenty-one".