20123220122221 has 16 divisors (see below), whose sum is σ = 20370371757120. Its totient is φ = 19877263660800.

The previous prime is 20123220122191. The next prime is 20123220122227. The reversal of 20123220122221 is 12222102232102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20123220122221 - 2²³ = 20123211733613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20123220122192 and 20123220122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123220122227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75177006 + ... + 75444208.

It is an arithmetic number, because the mean of its divisors is an integer number (1273148234820).

Almost surely, 2^{20123220122221} is an apocalyptic number.

It is an amenable number.

20123220122221 is a deficient number, since it is larger than the sum of its proper divisors (247151634899).

20123220122221 is a wasteful number, since it uses less digits than its factorization.

20123220122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269436.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 20123220122221 its reverse (12222102232102), we get a palindrome (32345322354323).

The spelling of 20123220122221 in words is "twenty trillion, one hundred twenty-three billion, two hundred twenty million, one hundred twenty-two thousand, two hundred twenty-one".