123221132021 has 4 divisors (see below), whose sum is σ = 132699680652. Its totient is φ = 113742583392.

The previous prime is 123221131967. The next prime is 123221132039. The reversal of 123221132021 is 120231122321.

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 5911456996 + 117309675025 = 76886^2 + 342505^2 .

It is a cyclic number.

It is not a de Polignac number, because 123221132021 - 2¹⁴ = 123221115637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123221131984 and 123221132002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123221132051) 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, 4739274296 + ... + 4739274321.

It is an arithmetic number, because the mean of its divisors is an integer number (33174920163).

Almost surely, 2^123221132021 is an apocalyptic number.

It is an amenable number.

123221132021 is a deficient number, since it is larger than the sum of its proper divisors (9478548631).

123221132021 is an equidigital number, since it uses as much as digits as its factorization.

123221132021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9478548630.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 123221132021 its reverse (120231122321), we get a palindrome (243452254342).

The spelling of 123221132021 in words is "one hundred twenty-three billion, two hundred twenty-one million, one hundred thirty-two thousand, twenty-one".