123231020021 has 8 divisors (see below), whose sum is σ = 129720328320. Its totient is φ = 116742058272.

The previous prime is 123231019987. The next prime is 123231020041. The reversal of 123231020021 is 120020132321.

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

It is a cyclic number.

It is not a de Polignac number, because 123231020021 - 2¹⁸ = 123230757877 is a prime.

It is a super-2 number, since 2×123231020021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123231020041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 980276 + ... + 1098818.

It is an arithmetic number, because the mean of its divisors is an integer number (16215041040).

Almost surely, 2^123231020021 is an apocalyptic number.

It is an amenable number.

123231020021 is a deficient number, since it is larger than the sum of its proper divisors (6489308299).

123231020021 is a wasteful number, since it uses less digits than its factorization.

123231020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173275.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 123231020021 its reverse (120020132321), we get a palindrome (243251152342).

The spelling of 123231020021 in words is "one hundred twenty-three billion, two hundred thirty-one million, twenty thousand, twenty-one".