21000002002206 has 64 divisors (see below), whose sum is σ = 45646987008000. Its totient is φ = 6416207769600.

The previous prime is 21000002002201. The next prime is 21000002002207. The reversal of 21000002002206 is 60220020000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000002002201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15025470 + ... + 16363518.

It is an arithmetic number, because the mean of its divisors is an integer number (713234172000).

Almost surely, 2^{21000002002206} is an apocalyptic number.

21000002002206 is an abundant number, since it is smaller than the sum of its proper divisors (24646985005794).

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

21000002002206 is a wasteful number, since it uses less digits than its factorization.

21000002002206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342545.

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

Adding to 21000002002206 its reverse (60220020000012), we get a palindrome (81220022002218).

The spelling of 21000002002206 in words is "twenty-one trillion, two million, two thousand, two hundred six".