21616030 has 16 divisors (see below), whose sum is σ = 39443184. Its totient is φ = 8527680.

The previous prime is 21616019. The next prime is 21616031. The reversal of 21616030 is 3061612.

It is a junction number, because it is equal to n+sod(n) for n = 21615989 and 21616007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616031) 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, 14076 + ... + 15535.

It is an arithmetic number, because the mean of its divisors is an integer number (2465199).

Almost surely, 2^21616030 is an apocalyptic number.

21616030 is a deficient number, since it is larger than the sum of its proper divisors (17827154).

21616030 is a wasteful number, since it uses less digits than its factorization.

21616030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29691.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21616030 is about 4649.3042490248. The cubic root of 21616030 is about 278.5642061933.

Adding to 21616030 its reverse (3061612), we get a palindrome (24677642).

The spelling of 21616030 in words is "twenty-one million, six hundred sixteen thousand, thirty".