21716030 has 16 divisors (see below), whose sum is σ = 44673120. Its totient is φ = 7445472.

The previous prime is 21716029. The next prime is 21716033. The reversal of 21716030 is 3061712.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21715993 and 21716011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716033) 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, 155045 + ... + 155184.

It is an arithmetic number, because the mean of its divisors is an integer number (2792070).

Almost surely, 2^21716030 is an apocalyptic number.

21716030 is an abundant number, since it is smaller than the sum of its proper divisors (22957090).

21716030 is a wasteful number, since it uses less digits than its factorization.

21716030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310243.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21716030 is about 4660.0461371107. The cubic root of 21716030 is about 278.9931097162.

Adding to 21716030 its reverse (3061712), we get a palindrome (24777742).

The spelling of 21716030 in words is "twenty-one million, seven hundred sixteen thousand, thirty".