21020110022201 has 2 divisors, whose sum is σ = 21020110022202. Its totient is φ = 21020110022200.

The previous prime is 21020110022189. The next prime is 21020110022279. The reversal of 21020110022201 is 10222001102012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14253343129600 + 6766766892601 = 3775360^2 + 2601301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020110022201 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020110022101) 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, 10510055011100 + 10510055011101.

It is an arithmetic number, because the mean of its divisors is an integer number (10510055011101).

Almost surely, 2^{21020110022201} is an apocalyptic number.

It is an amenable number.

21020110022201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020110022201 is an equidigital number, since it uses as much as digits as its factorization.

21020110022201 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 14.

Adding to 21020110022201 its reverse (10222001102012), we get a palindrome (31242111124213).

The spelling of 21020110022201 in words is "twenty-one trillion, twenty billion, one hundred ten million, twenty-two thousand, two hundred one".