10011221201921 has 2 divisors, whose sum is σ = 10011221201922. Its totient is φ = 10011221201920.

The previous prime is 10011221201879. The next prime is 10011221201939. The reversal of 10011221201921 is 12910212211001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9915098880625 + 96122321296 = 3148825^2 + 310036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10011221201921 is a prime.

It is not a weakly prime, because it can be changed into another prime (10011221201941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005610600960 + 5005610600961.

It is an arithmetic number, because the mean of its divisors is an integer number (5005610600961).

Almost surely, 2^{10011221201921} is an apocalyptic number.

It is an amenable number.

10011221201921 is a deficient number, since it is larger than the sum of its proper divisors (1).

10011221201921 is an equidigital number, since it uses as much as digits as its factorization.

10011221201921 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 10011221201921 its reverse (12910212211001), we get a palindrome (22921433412922).

The spelling of 10011221201921 in words is "ten trillion, eleven billion, two hundred twenty-one million, two hundred one thousand, nine hundred twenty-one".