21376065 has 8 divisors (see below), whose sum is σ = 34201728. Its totient is φ = 11400560.

The previous prime is 21376051. The next prime is 21376067. The reversal of 21376065 is 56067312.

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

It is not a de Polignac number, because 21376065 - 2⁴ = 21376049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21376067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712521 + ... + 712550.

It is an arithmetic number, because the mean of its divisors is an integer number (4275216).

Almost surely, 2^21376065 is an apocalyptic number.

It is an amenable number.

21376065 is a deficient number, since it is larger than the sum of its proper divisors (12825663).

21376065 is a wasteful number, since it uses less digits than its factorization.

21376065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425079.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 21376065 is about 4623.4256780011. The cubic root of 21376065 is about 277.5295642554.

The spelling of 21376065 in words is "twenty-one million, three hundred seventy-six thousand, sixty-five".