9011221210021 has 2 divisors, whose sum is σ = 9011221210022. Its totient is φ = 9011221210020.

The previous prime is 9011221209967. The next prime is 9011221210037. The reversal of 9011221210021 is 1200121221109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8203865049121 + 807356160900 = 2864239^2 + 898530^2 .

It is an emirp because it is prime and its reverse (1200121221109) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9011221210021 - 2²⁷ = 9011086992293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9011221209974 and 9011221210001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9011221211021) 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, 4505610605010 + 4505610605011.

It is an arithmetic number, because the mean of its divisors is an integer number (4505610605011).

Almost surely, 2^{9011221210021} is an apocalyptic number.

It is an amenable number.

9011221210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9011221210021 is an equidigital number, since it uses as much as digits as its factorization.

9011221210021 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 22.

The spelling of 9011221210021 in words is "nine trillion, eleven billion, two hundred twenty-one million, two hundred ten thousand, twenty-one".