20111001200221 has 2 divisors, whose sum is σ = 20111001200222. Its totient is φ = 20111001200220.

The previous prime is 20111001200177. The next prime is 20111001200249. The reversal of 20111001200221 is 12200210011102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18874801896196 + 1236199304025 = 4344514^2 + 1111845^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111001200221 - 2¹⁷ = 20111001069149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111001200291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055500600110 + 10055500600111.

It is an arithmetic number, because the mean of its divisors is an integer number (10055500600111).

Almost surely, 2^{20111001200221} is an apocalyptic number.

It is an amenable number.

20111001200221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111001200221 is an equidigital number, since it uses as much as digits as its factorization.

20111001200221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20111001200221 its reverse (12200210011102), we get a palindrome (32311211211323).

The spelling of 20111001200221 in words is "twenty trillion, one hundred eleven billion, one million, two hundred thousand, two hundred twenty-one".