21000002002205 has 32 divisors (see below), whose sum is σ = 25828772686080. Its totient is φ = 16385748526080.

The previous prime is 21000002002201. The next prime is 21000002002207. The reversal of 21000002002205 is 50220020000012.

It is not a de Polignac number, because 21000002002205 - 2² = 21000002002201 is a prime.

It is a super-2 number, since 2×21000002002205² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21000002002205.

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, 34590149 + ... + 35192021.

It is an arithmetic number, because the mean of its divisors is an integer number (807149146440).

Almost surely, 2^{21000002002205} is an apocalyptic number.

It is an amenable number.

21000002002205 is a deficient number, since it is larger than the sum of its proper divisors (4828770683875).

21000002002205 is a wasteful number, since it uses less digits than its factorization.

21000002002205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602901.

The product of its (nonzero) digits is 80, while the sum is 14.

Adding to 21000002002205 its reverse (50220020000012), we get a palindrome (71220022002217).

The spelling of 21000002002205 in words is "twenty-one trillion, two million, two thousand, two hundred five".