21021210210005 has 8 divisors (see below), whose sum is σ = 25314588127392. Its totient is φ = 16757544251088.

The previous prime is 21021210210001. The next prime is 21021210210047. The reversal of 21021210210005 is 50001201212012.

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

It is a cyclic number.

It is not a de Polignac number, because 21021210210005 - 2² = 21021210210001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021210210001) 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 7 ways as a sum of consecutive naturals, for example, 7427988059 + ... + 7427990888.

It is an arithmetic number, because the mean of its divisors is an integer number (3164323515924).

Almost surely, 2^{21021210210005} is an apocalyptic number.

It is an amenable number.

21021210210005 is a deficient number, since it is larger than the sum of its proper divisors (4293377917387).

21021210210005 is a wasteful number, since it uses less digits than its factorization.

21021210210005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14855979235.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21021210210005 its reverse (50001201212012), we get a palindrome (71022411422017).

The spelling of 21021210210005 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, two hundred ten thousand, five".