991120102101222 has 32 divisors (see below), whose sum is σ = 1991764599201792. Its totient is φ = 328789743230784.

The previous prime is 991120102101209. The next prime is 991120102101223. The reversal of 991120102101222 is 222101201021199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991120102101223) 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, 470828178 + ... + 472928549.

It is an arithmetic number, because the mean of its divisors is an integer number (62242643725056).

Almost surely, 2^{991120102101222} is an apocalyptic number.

991120102101222 is an abundant number, since it is smaller than the sum of its proper divisors (1000644497100570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991120102101222 is a wasteful number, since it uses less digits than its factorization.

991120102101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943757572.

The product of its (nonzero) digits is 2592, while the sum is 33.

The spelling of 991120102101222 in words is "nine hundred ninety-one trillion, one hundred twenty billion, one hundred two million, one hundred one thousand, two hundred twenty-two".