123212333021 has 4 divisors (see below), whose sum is σ = 123251216700. Its totient is φ = 123173449344.

The previous prime is 123212333009. The next prime is 123212333051. The reversal of 123212333021 is 120333212321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120333212321 = 7 ⋅17190458903.

It can be written as a sum of positive squares in 2 ways, for example, as 52317412900 + 70894920121 = 228730^2 + 266261^2 .

It is a cyclic number.

It is not a de Polignac number, because 123212333021 - 2¹⁴ = 123212316637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123212333051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19437086 + ... + 19443423.

It is an arithmetic number, because the mean of its divisors is an integer number (30812804175).

Almost surely, 2^123212333021 is an apocalyptic number.

It is an amenable number.

123212333021 is a deficient number, since it is larger than the sum of its proper divisors (38883679).

123212333021 is an equidigital number, since it uses as much as digits as its factorization.

123212333021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38883678.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 123212333021 its reverse (120333212321), we get a palindrome (243545545342).

The spelling of 123212333021 in words is "one hundred twenty-three billion, two hundred twelve million, three hundred thirty-three thousand, twenty-one".