91902021120 has 1280 divisors, whose sum is σ = 423472896000. Its totient is φ = 18345885696.

The previous prime is 91902021109. The next prime is 91902021187. The reversal of 91902021120 is 2112020919.

It is a tau number, because it is divible by the number of its divisors (1280).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 119508096 + ... + 119508864.

It is an arithmetic number, because the mean of its divisors is an integer number (330838200).

Almost surely, 2^91902021120 is an apocalyptic number.

91902021120 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 91902021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211736448000).

91902021120 is an abundant number, since it is smaller than the sum of its proper divisors (331570874880).

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

91902021120 is a wasteful number, since it uses less digits than its factorization.

91902021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 91902021120 in words is "ninety-one billion, nine hundred two million, twenty-one thousand, one hundred twenty".