20212111221121 has 2 divisors, whose sum is σ = 20212111221122. Its totient is φ = 20212111221120.

The previous prime is 20212111221097. The next prime is 20212111221157. The reversal of 20212111221121 is 12112211121202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20201968515600 + 10142705521 = 4494660^2 + 100711^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212111221121 - 2¹³ = 20212111212929 is a prime.

It is not a weakly prime, because it can be changed into another prime (20212111221221) 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 as a sum of consecutive naturals, namely, 10106055610560 + 10106055610561.

It is an arithmetic number, because the mean of its divisors is an integer number (10106055610561).

Almost surely, 2^{20212111221121} is an apocalyptic number.

It is an amenable number.

20212111221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212111221121 is an equidigital number, since it uses as much as digits as its factorization.

20212111221121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 20212111221121 its reverse (12112211121202), we get a palindrome (32324322342323).

The spelling of 20212111221121 in words is "twenty trillion, two hundred twelve billion, one hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".