21020200206 has 16 divisors (see below), whose sum is σ = 42729588048. Its totient is φ = 6891868800.

The previous prime is 21020200199. The next prime is 21020200207. The reversal of 21020200206 is 60200202012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020200207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28715755 + ... + 28716486.

It is an arithmetic number, because the mean of its divisors is an integer number (2670599253).

Almost surely, 2^21020200206 is an apocalyptic number.

21020200206 is an abundant number, since it is smaller than the sum of its proper divisors (21709387842).

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

21020200206 is a wasteful number, since it uses less digits than its factorization.

21020200206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57432307.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21020200206 its reverse (60200202012), we get a palindrome (81220402218).

The spelling of 21020200206 in words is "twenty-one billion, twenty million, two hundred thousand, two hundred six".