9912021222001 has 4 divisors (see below), whose sum is σ = 9938595005812. Its totient is φ = 9885447438192.

The previous prime is 9912021221981. The next prime is 9912021222017. The reversal of 9912021222001 is 1002221202199.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3882791430400 + 6029229791601 = 1970480^2 + 2455449^2 .

It is a cyclic number.

It is not a de Polignac number, because 9912021222001 - 2¹⁵ = 9912021189233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9912021222071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13286891346 + ... + 13286892091.

It is an arithmetic number, because the mean of its divisors is an integer number (2484648751453).

Almost surely, 2^{9912021222001} is an apocalyptic number.

It is an amenable number.

9912021222001 is a deficient number, since it is larger than the sum of its proper divisors (26573783811).

9912021222001 is a wasteful number, since it uses less digits than its factorization.

9912021222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26573783810.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 9912021222001 in words is "nine trillion, nine hundred twelve billion, twenty-one million, two hundred twenty-two thousand, one".