9999002212121 has 8 divisors (see below), whose sum is σ = 11401577183304. Its totient is φ = 8686915948800.

The previous prime is 9999002212063. The next prime is 9999002212123. The reversal of 9999002212121 is 1212122009999.

It can be written as a sum of positive squares in 4 ways, for example, as 3128370438400 + 6870631773721 = 1768720^2 + 2621189^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 9999002212121 - 2¹⁸ = 9999001949977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999002212123) 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, 22622176730 + ... + 22622177171.

It is an arithmetic number, because the mean of its divisors is an integer number (1425197147913).

Almost surely, 2^{9999002212121} is an apocalyptic number.

It is an amenable number.

9999002212121 is a deficient number, since it is larger than the sum of its proper divisors (1402574971183).

9999002212121 is a wasteful number, since it uses less digits than its factorization.

9999002212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45244353931.

The product of its (nonzero) digits is 104976, while the sum is 47.

The spelling of 9999002212121 in words is "nine trillion, nine hundred ninety-nine billion, two million, two hundred twelve thousand, one hundred twenty-one".