21200102012005 has 32 divisors (see below), whose sum is σ = 29516528830464. Its totient is φ = 14316281153856.

The previous prime is 21200102011999. The next prime is 21200102012039. The reversal of 21200102012005 is 50021020100212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21200102012005 - 2⁹ = 21200102011493 is a prime.

It is a super-3 number, since 3×21200102012005³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21200102012005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7248274 + ... + 9743596.

It is an arithmetic number, because the mean of its divisors is an integer number (922391525952).

Almost surely, 2^{21200102012005} is an apocalyptic number.

It is an amenable number.

21200102012005 is a deficient number, since it is larger than the sum of its proper divisors (8316426818459).

21200102012005 is a wasteful number, since it uses less digits than its factorization.

21200102012005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499025.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 21200102012005 its reverse (50021020100212), we get a palindrome (71221122112217).

The spelling of 21200102012005 in words is "twenty-one trillion, two hundred billion, one hundred two million, twelve thousand, five".