21452665 has 8 divisors (see below), whose sum is σ = 27723528. Its totient is φ = 15841920.

The previous prime is 21452659. The next prime is 21452671. The reversal of 21452665 is 56625412.

It is an interprime number because it is at equal distance from previous prime (21452659) and next prime (21452671).

It can be written as a sum of positive squares in 4 ways, for example, as 2347024 + 19105641 = 1532^2 + 4371^2 .

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

It is not a de Polignac number, because 21452665 - 2²¹ = 19355513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164956 + ... + 165085.

It is an arithmetic number, because the mean of its divisors is an integer number (3465441).

Almost surely, 2^21452665 is an apocalyptic number.

It is an amenable number.

21452665 is a deficient number, since it is larger than the sum of its proper divisors (6270863).

21452665 is a wasteful number, since it uses less digits than its factorization.

21452665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330059.

The product of its digits is 14400, while the sum is 31.

The square root of 21452665 is about 4631.7021709087. The cubic root of 21452665 is about 277.8606732448.

The spelling of 21452665 in words is "twenty-one million, four hundred fifty-two thousand, six hundred sixty-five".