110211211220021 has 2 divisors, whose sum is σ = 110211211220022. Its totient is φ = 110211211220020.

The previous prime is 110211211219937. The next prime is 110211211220023. The reversal of 110211211220021 is 120022112112011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102862476388996 + 7348734831025 = 10142114^2 + 2710855^2 .

It is a cyclic number.

It is not a de Polignac number, because 110211211220021 - 2¹⁴ = 110211211203637 is a prime.

It is a super-2 number, since 2×110211211220021² (a number of 29 digits) contains 22 as substring.

Together with 110211211220023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (110211211220023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55105605610010 + 55105605610011.

It is an arithmetic number, because the mean of its divisors is an integer number (55105605610011).

Almost surely, 2^{110211211220021} is an apocalyptic number.

It is an amenable number.

110211211220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

110211211220021 is an equidigital number, since it uses as much as digits as its factorization.

110211211220021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 110211211220021 its reverse (120022112112011), we get a palindrome (230233323332032).

The spelling of 110211211220021 in words is "one hundred ten trillion, two hundred eleven billion, two hundred eleven million, two hundred twenty thousand, twenty-one".