21202206 has 8 divisors (see below), whose sum is σ = 42404424. Its totient is φ = 7067400.

The previous prime is 21202201. The next prime is 21202211. The reversal of 21202206 is 60220212.

It is an interprime number because it is at equal distance from previous prime (21202201) and next prime (21202211).

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

21202206 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202201) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1766845 + ... + 1766856.

It is an arithmetic number, because the mean of its divisors is an integer number (5300553).

Almost surely, 2^21202206 is an apocalyptic number.

21202206 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21202206 is a wasteful number, since it uses less digits than its factorization.

21202206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533706.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21202206 is about 4604.5853233489. The cubic root of 21202206 is about 276.7751001553.

Adding to 21202206 its reverse (60220212), we get a palindrome (81422418).

The spelling of 21202206 in words is "twenty-one million, two hundred two thousand, two hundred six".