221220122012122 has 8 divisors (see below), whose sum is σ = 331880820941556. Its totient is φ = 110593181698272.

The previous prime is 221220122012081. The next prime is 221220122012137. The reversal of 221220122012122 is 221210221022122.

It can be written as a sum of positive squares in 2 ways, for example, as 178796771563081 + 42423350449041 = 13371491^2 + 6513321^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 221220122012093 and 221220122012102.

It is an unprimeable number.

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, 8439637513 + ... + 8439663724.

Almost surely, 2^{221220122012122} is an apocalyptic number.

221220122012122 is a deficient number, since it is larger than the sum of its proper divisors (110660698929434).

221220122012122 is a wasteful number, since it uses less digits than its factorization.

221220122012122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16879307792.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221220122012122 its reverse (221210221022122), we get a palindrome (442430343034244).

The spelling of 221220122012122 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, twelve thousand, one hundred twenty-two".