21376617 has 8 divisors (see below), whose sum is σ = 28691520. Its totient is φ = 14156400.

The previous prime is 21376613. The next prime is 21376627. The reversal of 21376617 is 71667312.

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

It is not a de Polignac number, because 21376617 - 2² = 21376613 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21376613) 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, 23142 + ... + 24047.

It is an arithmetic number, because the mean of its divisors is an integer number (3586440).

Almost surely, 2^21376617 is an apocalyptic number.

It is an amenable number.

21376617 is a deficient number, since it is larger than the sum of its proper divisors (7314903).

21376617 is a wasteful number, since it uses less digits than its factorization.

21376617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47343.

The product of its digits is 10584, while the sum is 33.

The square root of 21376617 is about 4623.4853736116. The cubic root of 21376617 is about 277.5319531423.

The spelling of 21376617 in words is "twenty-one million, three hundred seventy-six thousand, six hundred seventeen".