21610006 has 8 divisors (see below), whose sum is σ = 35361864. Its totient is φ = 9822720.

The previous prime is 21610003. The next prime is 21610019. The reversal of 21610006 is 60001612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21610003) 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 3 ways as a sum of consecutive naturals, for example, 491115 + ... + 491158.

It is an arithmetic number, because the mean of its divisors is an integer number (4420233).

Almost surely, 2^21610006 is an apocalyptic number.

21610006 is a deficient number, since it is larger than the sum of its proper divisors (13751858).

21610006 is a wasteful number, since it uses less digits than its factorization.

21610006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982286.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 21610006 is about 4648.6563650156. The cubic root of 21610006 is about 278.5383268391.

Adding to 21610006 its reverse (60001612), we get a palindrome (81611618).

The spelling of 21610006 in words is "twenty-one million, six hundred ten thousand, six".