21010022020205 has 8 divisors (see below), whose sum is σ = 25396055815032. Its totient is φ = 16685331355648.

The previous prime is 21010022020133. The next prime is 21010022020213. The reversal of 21010022020205 is 50202022001012.

It can be written as a sum of positive squares in 4 ways, for example, as 95689998244 + 20914332021961 = 309338^2 + 4573219^2 .

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 21010022020205 - 2³² = 21005727052909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15335781812 + ... + 15335783181.

It is an arithmetic number, because the mean of its divisors is an integer number (3174506976879).

Almost surely, 2^{21010022020205} is an apocalyptic number.

It is an amenable number.

21010022020205 is a deficient number, since it is larger than the sum of its proper divisors (4386033794827).

21010022020205 is a wasteful number, since it uses less digits than its factorization.

21010022020205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30671565135.

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 21010022020205 its reverse (50202022001012), we get a palindrome (71212044021217).

The spelling of 21010022020205 in words is "twenty-one trillion, ten billion, twenty-two million, twenty thousand, two hundred five".