999911010201221 has 16 divisors (see below), whose sum is σ = 1003765529712000. Its totient is φ = 996063361001280.

The previous prime is 999911010201143. The next prime is 999911010201281. The reversal of 999911010201221 is 122102010119999.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999911010201221 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 (999911010201281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5545389656 + ... + 5545569966.

It is an arithmetic number, because the mean of its divisors is an integer number (62735345607000).

Almost surely, 2^{999911010201221} is an apocalyptic number.

It is an amenable number.

999911010201221 is a deficient number, since it is larger than the sum of its proper divisors (3854519510779).

999911010201221 is a wasteful number, since it uses less digits than its factorization.

999911010201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199244.

The product of its (nonzero) digits is 52488, while the sum is 47.

The spelling of 999911010201221 in words is "nine hundred ninety-nine trillion, nine hundred eleven billion, ten million, two hundred one thousand, two hundred twenty-one".