221610006 has 20 divisors (see below), whose sum is σ = 496570932. Its totient is φ = 73869948.

The previous prime is 221609989. The next prime is 221610019. The reversal of 221610006 is 600016122.

It is a happy number.

It is a super-2 number, since 2×221610006² = 98221989518640072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 683820 + ... + 684143.

Almost surely, 2^221610006 is an apocalyptic number.

221610006 is an abundant number, since it is smaller than the sum of its proper divisors (274960926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221610006 is a wasteful number, since it uses less digits than its factorization.

221610006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367977 (or 1367968 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 221610006 is about 14886.5713312368. The cubic root of 221610006 is about 605.1501173373.

Adding to 221610006 its reverse (600016122), we get a palindrome (821626128).

The spelling of 221610006 in words is "two hundred twenty-one million, six hundred ten thousand, six".