123231022021 has 4 divisors (see below), whose sum is σ = 123473126700. Its totient is φ = 122988917344.

The previous prime is 123231021923. The next prime is 123231022037. The reversal of 123231022021 is 120220132321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55831073796 + 67399948225 = 236286^2 + 259615^2 .

It is a cyclic number.

It is not a de Polignac number, because 123231022021 - 2⁹ = 123231021509 is a prime.

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 123231022021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123231722021) 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, 121051576 + ... + 121052593.

It is an arithmetic number, because the mean of its divisors is an integer number (30868281675).

Almost surely, 2^123231022021 is an apocalyptic number.

It is an amenable number.

123231022021 is a deficient number, since it is larger than the sum of its proper divisors (242104679).

123231022021 is an equidigital number, since it uses as much as digits as its factorization.

123231022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242104678.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 123231022021 its reverse (120220132321), we get a palindrome (243451154342).

The spelling of 123231022021 in words is "one hundred twenty-three billion, two hundred thirty-one million, twenty-two thousand, twenty-one".