10001231021 has 4 divisors (see below), whose sum is σ = 10057104000. Its totient is φ = 9945358044.

The previous prime is 10001230991. The next prime is 10001231029. The reversal of 10001231021 is 12013210001.

10001231021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10001231021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10001230993 and 10001231011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001231029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27936221 + ... + 27936578.

It is an arithmetic number, because the mean of its divisors is an integer number (2514276000).

Almost surely, 2^10001231021 is an apocalyptic number.

It is an amenable number.

10001231021 is a deficient number, since it is larger than the sum of its proper divisors (55872979).

10001231021 is an equidigital number, since it uses as much as digits as its factorization.

10001231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55872978.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 10001231021 its reverse (12013210001), we get a palindrome (22014441022).

The spelling of 10001231021 in words is "ten billion, one million, two hundred thirty-one thousand, twenty-one".