991212110222 has 16 divisors (see below), whose sum is σ = 1519616592000. Its totient is φ = 484757669880.

The previous prime is 991212110221. The next prime is 991212110243. The reversal of 991212110222 is 222011212199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991212110221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21082304 + ... + 21129267.

It is an arithmetic number, because the mean of its divisors is an integer number (94976037000).

Almost surely, 2^991212110222 is an apocalyptic number.

991212110222 is a deficient number, since it is larger than the sum of its proper divisors (528404481778).

991212110222 is a wasteful number, since it uses less digits than its factorization.

991212110222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42211831.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 991212110222 in words is "nine hundred ninety-one billion, two hundred twelve million, one hundred ten thousand, two hundred twenty-two".