991222210201 has 16 divisors (see below), whose sum is σ = 1016817278400. Its totient is φ = 965743994880.

The previous prime is 991222210163. The next prime is 991222210207. The reversal of 991222210201 is 102012222199.

It is a cyclic number.

It is not a de Polignac number, because 991222210201 - 2¹¹ = 991222208153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991222210207) 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, 129179301 + ... + 129186973.

It is an arithmetic number, because the mean of its divisors is an integer number (63551079900).

Almost surely, 2^991222210201 is an apocalyptic number.

It is an amenable number.

991222210201 is a deficient number, since it is larger than the sum of its proper divisors (25595068199).

991222210201 is a wasteful number, since it uses less digits than its factorization.

991222210201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14856.

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

The spelling of 991222210201 in words is "nine hundred ninety-one billion, two hundred twenty-two million, two hundred ten thousand, two hundred one".