21212202008 has 16 divisors (see below), whose sum is σ = 39775798680. Its totient is φ = 10605322368.

The previous prime is 21212201963. The next prime is 21212202041. The reversal of 21212202008 is 80020221212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27935 + ... + 207857.

Almost surely, 2^21212202008 is an apocalyptic number.

It is an amenable number.

21212202008 is a deficient number, since it is larger than the sum of its proper divisors (18563596672).

21212202008 is a wasteful number, since it uses less digits than its factorization.

21212202008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194666 (or 194662 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The spelling of 21212202008 in words is "twenty-one billion, two hundred twelve million, two hundred two thousand, eight".