21212211308 has 12 divisors (see below), whose sum is σ = 37138099152. Its totient is φ = 10601325840.

The previous prime is 21212211299. The next prime is 21212211331. The reversal of 21212211308 is 80311221212.

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, 1184960 + ... + 1202727.

It is an arithmetic number, because the mean of its divisors is an integer number (3094841596).

Almost surely, 2^21212211308 is an apocalyptic number.

It is an amenable number.

21212211308 is a deficient number, since it is larger than the sum of its proper divisors (15925887844).

21212211308 is a wasteful number, since it uses less digits than its factorization.

21212211308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389912 (or 2389910 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The spelling of 21212211308 in words is "twenty-one billion, two hundred twelve million, two hundred eleven thousand, three hundred eight".