11012221001921 has 2 divisors, whose sum is σ = 11012221001922. Its totient is φ = 11012221001920.

The previous prime is 11012221001891. The next prime is 11012221002037. The reversal of 11012221001921 is 12910012221011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10990982020225 + 21238981696 = 3315265^2 + 145736^2 .

It is a cyclic number.

It is not a de Polignac number, because 11012221001921 - 2¹⁴ = 11012220985537 is a prime.

It is a super-2 number, since 2×11012221001921² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11012221001521) 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, 5506110500960 + 5506110500961.

It is an arithmetic number, because the mean of its divisors is an integer number (5506110500961).

Almost surely, 2^{11012221001921} is an apocalyptic number.

It is an amenable number.

11012221001921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11012221001921 is an equidigital number, since it uses as much as digits as its factorization.

11012221001921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

Adding to 11012221001921 its reverse (12910012221011), we get a palindrome (23922233222932).

The spelling of 11012221001921 in words is "eleven trillion, twelve billion, two hundred twenty-one million, one thousand, nine hundred twenty-one".