20212222202121 has 16 divisors (see below), whose sum is σ = 27679050432000. Its totient is φ = 13110132083328.

The previous prime is 20212222202023. The next prime is 20212222202131. The reversal of 20212222202121 is 12120222221202.

It is not a de Polignac number, because 20212222202121 - 2⁹ = 20212222201609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20212222202131) 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, 518556 + ... + 6379133.

It is an arithmetic number, because the mean of its divisors is an integer number (1729940652000).

Almost surely, 2^{20212222202121} is an apocalyptic number.

It is an amenable number.

20212222202121 is a deficient number, since it is larger than the sum of its proper divisors (7466828229879).

20212222202121 is a wasteful number, since it uses less digits than its factorization.

20212222202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6924128.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 20212222202121 its reverse (12120222221202), we get a palindrome (32332444423323).

The spelling of 20212222202121 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-two million, two hundred two thousand, one hundred twenty-one".