1000031231021 has 4 divisors (see below), whose sum is σ = 1007665057344. Its totient is φ = 992397404700.

The previous prime is 1000031231011. The next prime is 1000031231041. The reversal of 1000031231021 is 1201321300001.

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-1000031231021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000031230987 and 1000031231005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000031231011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3816912965 + ... + 3816913226.

It is an arithmetic number, because the mean of its divisors is an integer number (251916264336).

Almost surely, 2^{1000031231021} is an apocalyptic number.

It is an amenable number.

1000031231021 is a deficient number, since it is larger than the sum of its proper divisors (7633826323).

1000031231021 is an equidigital number, since it uses as much as digits as its factorization.

1000031231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7633826322.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 1000031231021 its reverse (1201321300001), we get a palindrome (2201352531022).

The spelling of 1000031231021 in words is "one trillion, thirty-one million, two hundred thirty-one thousand, twenty-one".