21200022020205 has 96 divisors (see below), whose sum is σ = 43923369724416. Its totient is φ = 9248661430272.

The previous prime is 21200022020189. The next prime is 21200022020209. The reversal of 21200022020205 is 50202022000212.

21200022020205 is a `hidden beast` number, since 21 + 200 + 0 + 220 + 20 + 205 = 666.

It is not a de Polignac number, because 21200022020205 - 2⁴ = 21200022020189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200022020209) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 241852 + ... + 6516021.

It is an arithmetic number, because the mean of its divisors is an integer number (457535101296).

Almost surely, 2^{21200022020205} is an apocalyptic number.

It is an amenable number.

21200022020205 is an abundant number, since it is smaller than the sum of its proper divisors (22723347704211).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21200022020205 is a wasteful number, since it uses less digits than its factorization.

21200022020205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6758347 (or 6758344 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

Adding to 21200022020205 its reverse (50202022000212), we get a palindrome (71402044020417).

The spelling of 21200022020205 in words is "twenty-one trillion, two hundred billion, twenty-two million, twenty thousand, two hundred five".