20211222112121 has 8 divisors (see below), whose sum is σ = 20909170622088. Its totient is φ = 19523035120000.

The previous prime is 20211222112117. The next prime is 20211222112157. The reversal of 20211222112121 is 12121122211202.

It can be written as a sum of positive squares in 4 ways, for example, as 173065152121 + 20038156960000 = 416011^2 + 4476400^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20211222112121 - 2² = 20211222112117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211222112093 and 20211222112102.

It is not an unprimeable number, because it can be changed into a prime (20211222112181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2440375250 + ... + 2440383531.

It is an arithmetic number, because the mean of its divisors is an integer number (2613646327761).

Almost surely, 2^{20211222112121} is an apocalyptic number.

It is an amenable number.

20211222112121 is a deficient number, since it is larger than the sum of its proper divisors (697948509967).

20211222112121 is a wasteful number, since it uses less digits than its factorization.

20211222112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4880758923.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 20211222112121 its reverse (12121122211202), we get a palindrome (32332344323323).

The spelling of 20211222112121 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twelve thousand, one hundred twenty-one".