21226020204 has 24 divisors (see below), whose sum is σ = 49530792640. Its totient is φ = 7074852624.

The previous prime is 21226020203. The next prime is 21226020209. The reversal of 21226020204 is 40202062212.

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, 149607 + ... + 254625.

Almost surely, 2^21226020204 is an apocalyptic number.

It is an amenable number.

21226020204 is an abundant number, since it is smaller than the sum of its proper divisors (28304772436).

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

21226020204 is a wasteful number, since it uses less digits than its factorization.

21226020204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121869 (or 121867 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21226020204 its reverse (40202062212), we get a palindrome (61428082416).

The spelling of 21226020204 in words is "twenty-one billion, two hundred twenty-six million, twenty thousand, two hundred four".