989999021201 has 4 divisors (see below), whose sum is σ = 996072634992. Its totient is φ = 983925407412.

The previous prime is 989999021191. The next prime is 989999021237. The reversal of 989999021201 is 102120999989.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989999021201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (989999021281) 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, 3036806651 + ... + 3036806976.

It is an arithmetic number, because the mean of its divisors is an integer number (249018158748).

Almost surely, 2^989999021201 is an apocalyptic number.

It is an amenable number.

989999021201 is a deficient number, since it is larger than the sum of its proper divisors (6073613791).

989999021201 is a wasteful number, since it uses less digits than its factorization.

989999021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6073613790.

The product of its (nonzero) digits is 1889568, while the sum is 59.

The spelling of 989999021201 in words is "nine hundred eighty-nine billion, nine hundred ninety-nine million, twenty-one thousand, two hundred one".