21226020202 has 16 divisors (see below), whose sum is σ = 33531755040. Its totient is φ = 10049334768.

The previous prime is 21226020187. The next prime is 21226020203. The reversal of 21226020202 is 20202062212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21226020202.

It is not an unprimeable number, because it can be changed into a prime (21226020203) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 65053 + ... + 216064.

It is an arithmetic number, because the mean of its divisors is an integer number (2095734690).

Almost surely, 2^21226020202 is an apocalyptic number.

21226020202 is a deficient number, since it is larger than the sum of its proper divisors (12305734838).

21226020202 is a wasteful number, since it uses less digits than its factorization.

21226020202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283125.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21226020202 its reverse (20202062212), we get a palindrome (41428082414).

The spelling of 21226020202 in words is "twenty-one billion, two hundred twenty-six million, twenty thousand, two hundred two".