21021103202013 has 24 divisors (see below), whose sum is σ = 30389333832000. Its totient is φ = 14002294126464.

The previous prime is 21021103201979. The next prime is 21021103202093. The reversal of 21021103202013 is 31020230112012.

21021103202013 is a `hidden beast` number, since 210 + 2 + 110 + 320 + 20 + 1 + 3 = 666.

It is not a de Polignac number, because 21021103202013 - 2²⁵ = 21021069647581 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021103202093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89728693 + ... + 89962661.

It is an arithmetic number, because the mean of its divisors is an integer number (1266222243000).

Almost surely, 2^{21021103202013} is an apocalyptic number.

It is an amenable number.

21021103202013 is a deficient number, since it is larger than the sum of its proper divisors (9368230629987).

21021103202013 is a wasteful number, since it uses less digits than its factorization.

21021103202013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242321 (or 242318 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21021103202013 its reverse (31020230112012), we get a palindrome (52041333314025).

The spelling of 21021103202013 in words is "twenty-one trillion, twenty-one billion, one hundred three million, two hundred two thousand, thirteen".