10031030021 has 4 divisors (see below), whose sum is σ = 10032560844. Its totient is φ = 10029499200.

The previous prime is 10031030017. The next prime is 10031030039. The reversal of 10031030021 is 12003013001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2593864900 + 7437165121 = 50930^2 + 86239^2 .

It is a cyclic number.

It is not a de Polignac number, because 10031030021 - 2² = 10031030017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10031029984 and 10031030011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10031030011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755540 + ... + 768701.

It is an arithmetic number, because the mean of its divisors is an integer number (2508140211).

Almost surely, 2^10031030021 is an apocalyptic number.

It is an amenable number.

10031030021 is a deficient number, since it is larger than the sum of its proper divisors (1530823).

10031030021 is an equidigital number, since it uses as much as digits as its factorization.

10031030021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530822.

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

Adding to 10031030021 its reverse (12003013001), we get a palindrome (22034043022).

The spelling of 10031030021 in words is "ten billion, thirty-one million, thirty thousand, twenty-one".