91000121200 has 30 divisors (see below), whose sum is σ = 218627792144. Its totient is φ = 36400048320.

The previous prime is 91000121183. The next prime is 91000121203. The reversal of 91000121200 is 212100019.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91000121203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 113749752 + ... + 113750551.

Almost surely, 2^91000121200 is an apocalyptic number.

It is an amenable number.

91000121200 is an abundant number, since it is smaller than the sum of its proper divisors (127627670944).

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

91000121200 is a wasteful number, since it uses less digits than its factorization.

91000121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227500321 (or 227500310 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 91000121200 its reverse (212100019), we get a palindrome (91212221219).

The spelling of 91000121200 in words is "ninety-one billion, one hundred twenty-one thousand, two hundred".