2189617921 has 8 divisors (see below), whose sum is σ = 2241556064. Its totient is φ = 2137726080.

The previous prime is 2189617889. The next prime is 2189617951. The reversal of 2189617921 is 1297169812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2189617921 - 2⁵ = 2189617889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2189617951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95761 + ... + 116401.

It is an arithmetic number, because the mean of its divisors is an integer number (280194508).

Almost surely, 2^2189617921 is an apocalyptic number.

It is an amenable number.

2189617921 is a deficient number, since it is larger than the sum of its proper divisors (51938143).

2189617921 is a wasteful number, since it uses less digits than its factorization.

2189617921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23151.

The product of its digits is 108864, while the sum is 46.

The square root of 2189617921 is about 46793.3533848558. The cubic root of 2189617921 is about 1298.5423347978.

The spelling of 2189617921 in words is "two billion, one hundred eighty-nine million, six hundred seventeen thousand, nine hundred twenty-one".