21212102201212 has 12 divisors (see below), whose sum is σ = 39976654148536. Its totient is φ = 9790201015920.

The previous prime is 21212102201209. The next prime is 21212102201281. The reversal of 21212102201212 is 21210220121212.

It is a super-3 number, since 3×21212102201212³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21212102201212.

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, 203962521114 + ... + 203962521217.

Almost surely, 2^{21212102201212} is an apocalyptic number.

It is an amenable number.

21212102201212 is a deficient number, since it is larger than the sum of its proper divisors (18764551947324).

21212102201212 is a wasteful number, since it uses less digits than its factorization.

21212102201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407925042348 (or 407925042346 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21212102201212 its reverse (21210220121212), we get a palindrome (42422322322424).

The spelling of 21212102201212 in words is "twenty-one trillion, two hundred twelve billion, one hundred two million, two hundred one thousand, two hundred twelve".