21112212808 has 32 divisors (see below), whose sum is σ = 41316226560. Its totient is φ = 10094768640.

The previous prime is 21112212769. The next prime is 21112212809. The reversal of 21112212808 is 80821221112.

It is not an unprimeable number, because it can be changed into a prime (21112212809) 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, 960841 + ... + 982567.

It is an arithmetic number, because the mean of its divisors is an integer number (1291132080).

Almost surely, 2^21112212808 is an apocalyptic number.

It is an amenable number.

21112212808 is a deficient number, since it is larger than the sum of its proper divisors (20204013752).

21112212808 is a wasteful number, since it uses less digits than its factorization.

21112212808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27037 (or 27033 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The spelling of 21112212808 in words is "twenty-one billion, one hundred twelve million, two hundred twelve thousand, eight hundred eight".