21875617 has 8 divisors (see below), whose sum is σ = 23249376. Its totient is φ = 20511552.

The previous prime is 21875611. The next prime is 21875629. The reversal of 21875617 is 71657812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21875617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21875611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2538 + ... + 7084.

It is an arithmetic number, because the mean of its divisors is an integer number (2906172).

Almost surely, 2^21875617 is an apocalyptic number.

It is an amenable number.

21875617 is a deficient number, since it is larger than the sum of its proper divisors (1373759).

21875617 is a wasteful number, since it uses less digits than its factorization.

21875617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4847.

The product of its digits is 23520, while the sum is 37.

The square root of 21875617 is about 4677.1376930768. The cubic root of 21875617 is about 279.6748649474.

The spelling of 21875617 in words is "twenty-one million, eight hundred seventy-five thousand, six hundred seventeen".