10031221021 has 2 divisors, whose sum is σ = 10031221022. Its totient is φ = 10031221020.

The previous prime is 10031221001. The next prime is 10031221033. The reversal of 10031221021 is 12012213001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8970741796 + 1060479225 = 94714^2 + 32565^2 .

It is a cyclic number.

It is not a de Polignac number, because 10031221021 - 2⁷ = 10031220893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10031220992 and 10031221010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10031221001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5015610510 + 5015610511.

It is an arithmetic number, because the mean of its divisors is an integer number (5015610511).

Almost surely, 2^10031221021 is an apocalyptic number.

It is an amenable number.

10031221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10031221021 is an equidigital number, since it uses as much as digits as its factorization.

10031221021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 10031221021 its reverse (12012213001), we get a palindrome (22043434022).

The spelling of 10031221021 in words is "ten billion, thirty-one million, two hundred twenty-one thousand, twenty-one".