122122122221 has 4 divisors (see below), whose sum is σ = 133224133344. Its totient is φ = 111020111100.

The previous prime is 122122122211. The next prime is 122122122251. The reversal of 122122122221 is 122221221221.

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 122122122221 - 2¹⁴ = 122122105837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122122122193 and 122122122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122122122211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5551005545 + ... + 5551005566.

It is an arithmetic number, because the mean of its divisors is an integer number (33306033336).

Almost surely, 2^122122122221 is an apocalyptic number.

122122122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

122122122221 is a deficient number, since it is larger than the sum of its proper divisors (11102011123).

122122122221 is a wasteful number, since it uses less digits than its factorization.

122122122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11102011122.

The product of its digits is 256, while the sum is 20.

Adding to 122122122221 its reverse (122221221221), we get a palindrome (244343343442).

It can be divided in two parts, 122122122 and 221, that multiplied together give a palindrome (26988988962).

The spelling of 122122122221 in words is "one hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".