91221787300 has 144 divisors (see below), whose sum is σ = 245819822080. Its totient is φ = 28674000000.

The previous prime is 91221787253. The next prime is 91221787303. The reversal of 91221787300 is 378712219.

It is a happy number.

It is a super-4 number, since 4×91221787300⁴ (a number of 45 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (91221787303) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 301675 + ... + 522925.

Almost surely, 2^91221787300 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91221787300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122909911040).

91221787300 is an abundant number, since it is smaller than the sum of its proper divisors (154598034780).

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

91221787300 is a wasteful number, since it uses less digits than its factorization.

91221787300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221322 (or 221315 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The spelling of 91221787300 in words is "ninety-one billion, two hundred twenty-one million, seven hundred eighty-seven thousand, three hundred".