21212141312 has 18 divisors (see below), whose sum is σ = 42341423208. Its totient is φ = 10606070528.

The previous prime is 21212141303. The next prime is 21212141317. The reversal of 21212141312 is 21314121212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212141317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41429708 + ... + 41430219.

Almost surely, 2^21212141312 is an apocalyptic number.

It is an amenable number.

21212141312 is a deficient number, since it is larger than the sum of its proper divisors (21129281896).

21212141312 is an frugal number, since it uses more digits than its factorization.

21212141312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82859943 (or 82859929 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

Adding to 21212141312 its reverse (21314121212), we get a palindrome (42526262524).

The spelling of 21212141312 in words is "twenty-one billion, two hundred twelve million, one hundred forty-one thousand, three hundred twelve".