9121989420 has 48 divisors (see below), whose sum is σ = 28379524320. Its totient is φ = 2432530368.

The previous prime is 9121989403. The next prime is 9121989449. The reversal of 9121989420 is 249891219.

9121989420 is a `hidden beast` number, since 9 + 1 + 219 + 8 + 9 + 420 = 666.

9121989420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 15 ways as a sum of consecutive naturals, for example, 8445747 + ... + 8446826.

It is an arithmetic number, because the mean of its divisors is an integer number (591240090).

Almost surely, 2^9121989420 is an apocalyptic number.

9121989420 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9121989420 is an abundant number, since it is smaller than the sum of its proper divisors (19257534900).

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

9121989420 is a wasteful number, since it uses less digits than its factorization.

9121989420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16892591 (or 16892583 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 9121989420 is about 95509.1064768172. The cubic root of 9121989420 is about 2089.4397604009.

The spelling of 9121989420 in words is "nine billion, one hundred twenty-one million, nine hundred eighty-nine thousand, four hundred twenty".