21031200206 has 8 divisors (see below), whose sum is σ = 33207158280. Its totient is φ = 9962147448.

The previous prime is 21031200199. The next prime is 21031200217. The reversal of 21031200206 is 60200213012.

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

It is a super-2 number, since 2×21031200206² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276726281 + ... + 276726356.

It is an arithmetic number, because the mean of its divisors is an integer number (4150894785).

Almost surely, 2^21031200206 is an apocalyptic number.

21031200206 is a deficient number, since it is larger than the sum of its proper divisors (12175958074).

21031200206 is a wasteful number, since it uses less digits than its factorization.

21031200206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553452658.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21031200206 its reverse (60200213012), we get a palindrome (81231413218).

The spelling of 21031200206 in words is "twenty-one billion, thirty-one million, two hundred thousand, two hundred six".