21211200021212 has 12 divisors (see below), whose sum is σ = 37157056754496. Its totient is φ = 10594898091360.

The previous prime is 21211200021211. The next prime is 21211200021229. The reversal of 21211200021212 is 21212000211212.

It is a super-3 number, since 3×21211200021212³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211200021211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2675475353 + ... + 2675483280.

It is an arithmetic number, because the mean of its divisors is an integer number (3096421396208).

Almost surely, 2^{21211200021212} is an apocalyptic number.

It is an amenable number.

21211200021212 is a deficient number, since it is larger than the sum of its proper divisors (15945856733284).

21211200021212 is a wasteful number, since it uses less digits than its factorization.

21211200021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5350959628 (or 5350959626 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21211200021212 its reverse (21212000211212), we get a palindrome (42423200232424).

The spelling of 21211200021212 in words is "twenty-one trillion, two hundred eleven billion, two hundred million, twenty-one thousand, two hundred twelve".