21716607 has 8 divisors (see below), whose sum is σ = 31587840. Its totient is φ = 13161560.

The previous prime is 21716603. The next prime is 21716609. The reversal of 21716607 is 70661712.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21716607 - 2² = 21716603 is a prime.

It is a super-2 number, since 2×21716607² = 943222039184898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329007 + ... + 329072.

It is an arithmetic number, because the mean of its divisors is an integer number (3948480).

Almost surely, 2^21716607 is an apocalyptic number.

21716607 is a deficient number, since it is larger than the sum of its proper divisors (9871233).

21716607 is a wasteful number, since it uses less digits than its factorization.

21716607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658093.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 21716607 is about 4660.1080459577. The cubic root of 21716607 is about 278.9955806651.

It can be divided in two parts, 2171 and 6607, that added together give a palindrome (8778).

The spelling of 21716607 in words is "twenty-one million, seven hundred sixteen thousand, six hundred seven".