21376089 has 32 divisors (see below), whose sum is σ = 38327040. Its totient is φ = 11494656.

The previous prime is 21376073. The next prime is 21376093. The reversal of 21376089 is 98067312.

It is not a de Polignac number, because 21376089 - 2⁴ = 21376073 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21376009) 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 31 ways as a sum of consecutive naturals, for example, 114 + ... + 6539.

It is an arithmetic number, because the mean of its divisors is an integer number (1197720).

Almost surely, 2^21376089 is an apocalyptic number.

It is an amenable number.

21376089 is a deficient number, since it is larger than the sum of its proper divisors (16950951).

21376089 is a wasteful number, since it uses less digits than its factorization.

21376089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6686 (or 6680 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21376089 is about 4623.4282734785. The cubic root of 21376089 is about 277.5296681209.

The spelling of 21376089 in words is "twenty-one million, three hundred seventy-six thousand, eighty-nine".