21200201020 has 12 divisors (see below), whose sum is σ = 44520422184. Its totient is φ = 8480080400.

The previous prime is 21200200997. The next prime is 21200201063. The reversal of 21200201020 is 2010200212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21200200988 and 21200201006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530005006 + ... + 530005045.

It is an arithmetic number, because the mean of its divisors is an integer number (3710035182).

Almost surely, 2^21200201020 is an apocalyptic number.

21200201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200201020 is an abundant number, since it is smaller than the sum of its proper divisors (23320221164).

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

21200201020 is a wasteful number, since it uses less digits than its factorization.

21200201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060010060 (or 1060010058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21200201020 its reverse (2010200212), we get a palindrome (23210401232).

The spelling of 21200201020 in words is "twenty-one billion, two hundred million, two hundred one thousand, twenty".