20122122211221 has 16 divisors (see below), whose sum is σ = 27720072806400. Its totient is φ = 12970244531760.

The previous prime is 20122122211091. The next prime is 20122122211253. The reversal of 20122122211221 is 12211222122102.

It is not a de Polignac number, because 20122122211221 - 2¹¹ = 20122122209173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122122211271) 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 15 ways as a sum of consecutive naturals, for example, 97978521 + ... + 98183678.

It is an arithmetic number, because the mean of its divisors is an integer number (1732504550400).

Almost surely, 2^{20122122211221} is an apocalyptic number.

It is an amenable number.

20122122211221 is a deficient number, since it is larger than the sum of its proper divisors (7597950595179).

20122122211221 is a wasteful number, since it uses less digits than its factorization.

20122122211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196163336.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 20122122211221 its reverse (12211222122102), we get a palindrome (32333344333323).

The spelling of 20122122211221 in words is "twenty trillion, one hundred twenty-two billion, one hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".