11000219921 has 2 divisors, whose sum is σ = 11000219922. Its totient is φ = 11000219920.

The previous prime is 11000219899. The next prime is 11000219939. The reversal of 11000219921 is 12991200011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10575859921 + 424360000 = 102839^2 + 20600^2 .

It is a cyclic number.

It is not a de Polignac number, because 11000219921 - 2¹⁸ = 10999957777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11000219981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5500109960 + 5500109961.

It is an arithmetic number, because the mean of its divisors is an integer number (5500109961).

Almost surely, 2^11000219921 is an apocalyptic number.

It is an amenable number.

11000219921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11000219921 is an equidigital number, since it uses as much as digits as its factorization.

11000219921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 26.

Adding to 11000219921 its reverse (12991200011), we get a palindrome (23991419932).

The spelling of 11000219921 in words is "eleven billion, two hundred nineteen thousand, nine hundred twenty-one".