123122121221 has 4 divisors (see below), whose sum is σ = 134315041344. Its totient is φ = 111929201100.

The previous prime is 123122121209. The next prime is 123122121259. The reversal of 123122121221 is 122121221321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123122121221 - 2³⁴ = 105942252037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123122121193 and 123122121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123122141221) 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, 5596460045 + ... + 5596460066.

It is an arithmetic number, because the mean of its divisors is an integer number (33578760336).

Almost surely, 2^123122121221 is an apocalyptic number.

123122121221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123122121221 is a deficient number, since it is larger than the sum of its proper divisors (11192920123).

123122121221 is a wasteful number, since it uses less digits than its factorization.

123122121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11192920122.

The product of its digits is 192, while the sum is 20.

Adding to 123122121221 its reverse (122121221321), we get a palindrome (245243342542).

The spelling of 123122121221 in words is "one hundred twenty-three billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".