991003021022201 has 16 divisors (see below), whose sum is σ = 1107484424651520. Its totient is φ = 879171322806480.

The previous prime is 991003021022159. The next prime is 991003021022243. The reversal of 991003021022201 is 102220120300199.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (991003021022159) and next prime (991003021022243).

It is not a de Polignac number, because 991003021022201 - 2³⁴ = 990985841153017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991003021022291) 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, 6283306811 + ... + 6283464528.

It is an arithmetic number, because the mean of its divisors is an integer number (69217776540720).

Almost surely, 2^{991003021022201} is an apocalyptic number.

It is an amenable number.

991003021022201 is a deficient number, since it is larger than the sum of its proper divisors (116481403629319).

991003021022201 is a wasteful number, since it uses less digits than its factorization.

991003021022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12566771524.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 991003021022201 in words is "nine hundred ninety-one trillion, three billion, twenty-one million, twenty-two thousand, two hundred one".