9111210012221 has 8 divisors (see below), whose sum is σ = 9352262969688. Its totient is φ = 8873114760000.

The previous prime is 9111210012209. The next prime is 9111210012241. The reversal of 9111210012221 is 1222100121119.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 925946232121 + 8185263780100 = 962261^2 + 2860990^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9111210012221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9111210012241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 739420070 + ... + 739432391.

It is an arithmetic number, because the mean of its divisors is an integer number (1169032871211).

Almost surely, 2^{9111210012221} is an apocalyptic number.

It is an amenable number.

9111210012221 is a deficient number, since it is larger than the sum of its proper divisors (241052957467).

9111210012221 is a wasteful number, since it uses less digits than its factorization.

9111210012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478852623.

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

The spelling of 9111210012221 in words is "nine trillion, one hundred eleven billion, two hundred ten million, twelve thousand, two hundred twenty-one".