21303212212 has 12 divisors (see below), whose sum is σ = 37377962496. Its totient is φ = 10623794360.

The previous prime is 21303212149. The next prime is 21303212221. The reversal of 21303212212 is 21221230312.

It is a self number, because there is not a number n which added to its sum of digits gives 21303212212.

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, 6951214 + ... + 6954277.

It is an arithmetic number, because the mean of its divisors is an integer number (3114830208).

Almost surely, 2^21303212212 is an apocalyptic number.

It is an amenable number.

21303212212 is a deficient number, since it is larger than the sum of its proper divisors (16074750284).

21303212212 is a wasteful number, since it uses less digits than its factorization.

21303212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13905878 (or 13905876 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21303212212 its reverse (21221230312), we get a palindrome (42524442524).

The spelling of 21303212212 in words is "twenty-one billion, three hundred three million, two hundred twelve thousand, two hundred twelve".