21226020208 has 20 divisors (see below), whose sum is σ = 43544556720. Its totient is φ = 9988715264.

The previous prime is 21226020203. The next prime is 21226020209. The reversal of 21226020208 is 80202062212.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39018148 + ... + 39018691.

It is an arithmetic number, because the mean of its divisors is an integer number (2177227836).

Almost surely, 2^21226020208 is an apocalyptic number.

It is an amenable number.

21226020208 is an abundant number, since it is smaller than the sum of its proper divisors (22318536512).

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

21226020208 is a wasteful number, since it uses less digits than its factorization.

21226020208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78036864 (or 78036858 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The spelling of 21226020208 in words is "twenty-one billion, two hundred twenty-six million, twenty thousand, two hundred eight".