20211211122221 has 16 divisors (see below), whose sum is σ = 23121901017600. Its totient is φ = 17306366214528.

The previous prime is 20211211122197. The next prime is 20211211122301. The reversal of 20211211122221 is 12222111211202.

It is a cyclic number.

It is not a de Polignac number, because 20211211122221 - 2¹⁴ = 20211211105837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211211122193 and 20211211122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211211322221) 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, 219190595 + ... + 219282783.

It is an arithmetic number, because the mean of its divisors is an integer number (1445118813600).

Almost surely, 2^{20211211122221} is an apocalyptic number.

It is an amenable number.

20211211122221 is a deficient number, since it is larger than the sum of its proper divisors (2910689895379).

20211211122221 is a wasteful number, since it uses less digits than its factorization.

20211211122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123548.

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

Adding to 20211211122221 its reverse (12222111211202), we get a palindrome (32433322333423).

The spelling of 20211211122221 in words is "twenty trillion, two hundred eleven billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".