21530503122212 has 12 divisors (see below), whose sum is σ = 43061006244480. Its totient is φ = 9227358480936.

The previous prime is 21530503122199. The next prime is 21530503122221. The reversal of 21530503122212 is 21222130503512.

It is a happy number.

21530503122212 is an admirable 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, 384473270012 + ... + 384473270067.

It is an arithmetic number, because the mean of its divisors is an integer number (3588417187040).

Almost surely, 2^{21530503122212} is an apocalyptic number.

It is an amenable number.

21530503122212 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.

21530503122212 is a wasteful number, since it uses less digits than its factorization.

21530503122212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768946540090 (or 768946540088 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21530503122212 its reverse (21222130503512), we get a palindrome (42752633625724).

The spelling of 21530503122212 in words is "twenty-one trillion, five hundred thirty billion, five hundred three million, one hundred twenty-two thousand, two hundred twelve".