91204218000 has 1920 divisors, whose sum is σ = 425852743680. Its totient is φ = 18363801600.

The previous prime is 91204217999. The next prime is 91204218029. The reversal of 91204218000 is 81240219.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 1098845959 + ... + 1098846041.

It is an arithmetic number, because the mean of its divisors is an integer number (221798304).

Almost surely, 2^91204218000 is an apocalyptic number.

91204218000 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91204218000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212926371840).

91204218000 is an abundant number, since it is smaller than the sum of its proper divisors (334648525680).

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

91204218000 is a wasteful number, since it uses less digits than its factorization.

91204218000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

Adding to 91204218000 its reverse (81240219), we get a palindrome (91285458219).

The spelling of 91204218000 in words is "ninety-one billion, two hundred four million, two hundred eighteen thousand".