9001010101221 has 12 divisors (see below), whose sum is σ = 13001489374848. Its totient is φ = 6000659397864.

The previous prime is 9001010101211. The next prime is 9001010101243. The reversal of 9001010101221 is 1221010101009.

It is a happy number.

It is not a de Polignac number, because 9001010101221 - 2⁵ = 9001010101189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9001010101194 and 9001010101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9001010101211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4206316 + ... + 5974538.

It is an arithmetic number, because the mean of its divisors is an integer number (1083457447904).

Almost surely, 2^{9001010101221} is an apocalyptic number.

It is an amenable number.

9001010101221 is a deficient number, since it is larger than the sum of its proper divisors (4000479273627).

9001010101221 is a wasteful number, since it uses less digits than its factorization.

9001010101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333832 (or 2333829 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 9001010101221 in words is "nine trillion, one billion, ten million, one hundred one thousand, two hundred twenty-one".