21212003212 has 12 divisors (see below), whose sum is σ = 38026396296. Its totient is φ = 10347318560.

The previous prime is 21212003209. The next prime is 21212003227. The reversal of 21212003212 is 21230021212.

It is a happy 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, 64670578 + ... + 64670905.

It is an arithmetic number, because the mean of its divisors is an integer number (3168866358).

Almost surely, 2^21212003212 is an apocalyptic number.

It is an amenable number.

21212003212 is a deficient number, since it is larger than the sum of its proper divisors (16814393084).

21212003212 is a wasteful number, since it uses less digits than its factorization.

21212003212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129341528 (or 129341526 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21212003212 its reverse (21230021212), we get a palindrome (42442024424).

The spelling of 21212003212 in words is "twenty-one billion, two hundred twelve million, three thousand, two hundred twelve".