11211000020221 has 2 divisors, whose sum is σ = 11211000020222. Its totient is φ = 11211000020220.

The previous prime is 11211000020189. The next prime is 11211000020249. The reversal of 11211000020221 is 12202000011211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8386734912196 + 2824265108025 = 2895986^2 + 1680555^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211000020221 - 2⁵ = 11211000020189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211000020291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605500010110 + 5605500010111.

It is an arithmetic number, because the mean of its divisors is an integer number (5605500010111).

Almost surely, 2^{11211000020221} is an apocalyptic number.

It is an amenable number.

11211000020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211000020221 is an equidigital number, since it uses as much as digits as its factorization.

11211000020221 is an evil number, because the sum of its binary digits is even.

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

Adding to 11211000020221 its reverse (12202000011211), we get a palindrome (23413000031432).

The spelling of 11211000020221 in words is "eleven trillion, two hundred eleven billion, twenty thousand, two hundred twenty-one".