21222020122121 has 64 divisors (see below), whose sum is σ = 27020166168576. Its totient is φ = 16220807539200.

The previous prime is 21222020122099. The next prime is 21222020122123. The reversal of 21222020122121 is 12122102022212.

It is a cyclic number.

It is not a de Polignac number, because 21222020122121 - 2⁶ = 21222020122057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222020122093 and 21222020122102.

It is not an unprimeable number, because it can be changed into a prime (21222020122123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 164745080 + ... + 164873846.

It is an arithmetic number, because the mean of its divisors is an integer number (422190096384).

Almost surely, 2^{21222020122121} is an apocalyptic number.

It is an amenable number.

21222020122121 is a deficient number, since it is larger than the sum of its proper divisors (5798146046455).

21222020122121 is a wasteful number, since it uses less digits than its factorization.

21222020122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129262.

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

Adding to 21222020122121 its reverse (12122102022212), we get a palindrome (33344122144333).

The spelling of 21222020122121 in words is "twenty-one trillion, two hundred twenty-two billion, twenty million, one hundred twenty-two thousand, one hundred twenty-one".