3100100000021 has 4 divisors (see below), whose sum is σ = 3100108766700. Its totient is φ = 3100091233344.

The previous prime is 3100100000009. The next prime is 3100100000033. The reversal of 3100100000021 is 1200000010013.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (3100100000009) and next prime (3100100000033).

It can be written as a sum of positive squares in 2 ways, for example, as 2340089170225 + 760010829796 = 1529735^2 + 871786^2 .

It is a cyclic number.

It is not a de Polignac number, because 3100100000021 - 2¹⁰ = 3100099998997 is a prime.

It is a super-2 number, since 2×3100100000021² (a number of 26 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 = 3100099999954 and 3100100000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3100100300021) 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 3 ways as a sum of consecutive naturals, for example, 3829586 + ... + 4567923.

It is an arithmetic number, because the mean of its divisors is an integer number (775027191675).

Almost surely, 2^{3100100000021} is an apocalyptic number.

It is an amenable number.

3100100000021 is a deficient number, since it is larger than the sum of its proper divisors (8766679).

3100100000021 is an equidigital number, since it uses as much as digits as its factorization.

3100100000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8766678.

The product of its (nonzero) digits is 6, while the sum is 8.

Adding to 3100100000021 its reverse (1200000010013), we get a palindrome (4300100010034).

The spelling of 3100100000021 in words is "three trillion, one hundred billion, one hundred million, twenty-one", and thus it is an aban number.