21213331208 has 32 divisors (see below), whose sum is σ = 40745487360. Its totient is φ = 10350607680.

The previous prime is 21213331201. The next prime is 21213331213. The reversal of 21213331208 is 80213331212.

It is not an unprimeable number, because it can be changed into a prime (21213331201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109166 + ... + 233117.

It is an arithmetic number, because the mean of its divisors is an integer number (1273296480).

Almost surely, 2^21213331208 is an apocalyptic number.

It is an amenable number.

21213331208 is a deficient number, since it is larger than the sum of its proper divisors (19532156152).

21213331208 is a wasteful number, since it uses less digits than its factorization.

21213331208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342477 (or 342473 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 21213331208 in words is "twenty-one billion, two hundred thirteen million, three hundred thirty-one thousand, two hundred eight".