21826865208 has 32 divisors (see below), whose sum is σ = 54965471760. Its totient is φ = 7222513920.

The previous prime is 21826865143. The next prime is 21826865209. The reversal of 21826865208 is 80256862812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21826865209) 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, 3315883 + ... + 3322458.

Almost surely, 2^21826865208 is an apocalyptic number.

It is an amenable number.

21826865208 is an abundant number, since it is smaller than the sum of its proper divisors (33138606552).

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

21826865208 is a wasteful number, since it uses less digits than its factorization.

21826865208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6638487 (or 6638483 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 48.

The spelling of 21826865208 in words is "twenty-one billion, eight hundred twenty-six million, eight hundred sixty-five thousand, two hundred eight".