10031320021 has 2 divisors, whose sum is σ = 10031320022. Its totient is φ = 10031320020.

The previous prime is 10031320001. The next prime is 10031320069. The reversal of 10031320021 is 12002313001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6007955121 + 4023364900 = 77511^2 + 63430^2 .

It is a cyclic number.

It is not a de Polignac number, because 10031320021 - 2¹⁷ = 10031188949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10031319983 and 10031320010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10031320001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5015660010 + 5015660011.

It is an arithmetic number, because the mean of its divisors is an integer number (5015660011).

Almost surely, 2^10031320021 is an apocalyptic number.

It is an amenable number.

10031320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10031320021 is an equidigital number, since it uses as much as digits as its factorization.

10031320021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 10031320021 its reverse (12002313001), we get a palindrome (22033633022).

The spelling of 10031320021 in words is "ten billion, thirty-one million, three hundred twenty thousand, twenty-one".