21112222030121 has 2 divisors, whose sum is σ = 21112222030122. Its totient is φ = 21112222030120.

The previous prime is 21112222030099. The next prime is 21112222030139. The reversal of 21112222030121 is 12103022221112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17736403754521 + 3375818275600 = 4211461^2 + 1837340^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112222030121 - 2²⁶ = 21112154921257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112222030093 and 21112222030102.

It is not a weakly prime, because it can be changed into another prime (21112222030181) 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, 10556111015060 + 10556111015061.

It is an arithmetic number, because the mean of its divisors is an integer number (10556111015061).

Almost surely, 2^{21112222030121} is an apocalyptic number.

It is an amenable number.

21112222030121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112222030121 is an equidigital number, since it uses as much as digits as its factorization.

21112222030121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21112222030121 its reverse (12103022221112), we get a palindrome (33215244251233).

The spelling of 21112222030121 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-two million, thirty thousand, one hundred twenty-one".