991010321222 has 8 divisors (see below), whose sum is σ = 1486529982000. Its totient is φ = 495500327224.

The previous prime is 991010321219. The next prime is 991010321239. The reversal of 991010321222 is 222123010199.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2154722 + ... + 2573877.

It is an arithmetic number, because the mean of its divisors is an integer number (185816247750).

Almost surely, 2^991010321222 is an apocalyptic number.

991010321222 is a deficient number, since it is larger than the sum of its proper divisors (495519660778).

991010321222 is a wasteful number, since it uses less digits than its factorization.

991010321222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4833390.

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

The spelling of 991010321222 in words is "nine hundred ninety-one billion, ten million, three hundred twenty-one thousand, two hundred twenty-two".