21230211212 has 12 divisors (see below), whose sum is σ = 42460422480. Its totient is φ = 9098661936.

The previous prime is 21230211199. The next prime is 21230211307. The reversal of 21230211212 is 21211203212.

21230211212 is an admirable number.

It is a super-2 number, since 2×21230211212² (a number of 21 digits) contains 22 as substring.

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, 379110887 + ... + 379110942.

It is an arithmetic number, because the mean of its divisors is an integer number (3538368540).

Almost surely, 2^21230211212 is an apocalyptic number.

It is an amenable number.

21230211212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21230211212 is a wasteful number, since it uses less digits than its factorization.

21230211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758221840 (or 758221838 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21230211212 its reverse (21211203212), we get a palindrome (42441414424).

The spelling of 21230211212 in words is "twenty-one billion, two hundred thirty million, two hundred eleven thousand, two hundred twelve".