231033031021 has 8 divisors (see below), whose sum is σ = 248819561144. Its totient is φ = 213248609280.

The previous prime is 231033031007. The next prime is 231033031087. The reversal of 231033031021 is 120130330132.

231033031021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 39376449225 + 191656581796 = 198435^2 + 437786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231033031021 is a prime.

It is a super-2 number, since 2×231033031021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231033031021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231033031121) 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 7 ways as a sum of consecutive naturals, for example, 295740 + ... + 741301.

It is an arithmetic number, because the mean of its divisors is an integer number (31102445143).

Almost surely, 2^231033031021 is an apocalyptic number.

It is an amenable number.

231033031021 is a deficient number, since it is larger than the sum of its proper divisors (17786530123).

231033031021 is a wasteful number, since it uses less digits than its factorization.

231033031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054191.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 231033031021 its reverse (120130330132), we get a palindrome (351163361153).

The spelling of 231033031021 in words is "two hundred thirty-one billion, thirty-three million, thirty-one thousand, twenty-one".