21112211312 has 10 divisors (see below), whose sum is σ = 40904909448. Its totient is φ = 10556105648.

The previous prime is 21112211293. The next prime is 21112211339. The reversal of 21112211312 is 21311221112.

It is a happy number.

It is a super-2 number, since 2×21112211312² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659756588 + ... + 659756619.

Almost surely, 2^21112211312 is an apocalyptic number.

It is an amenable number.

21112211312 is a deficient number, since it is larger than the sum of its proper divisors (19792698136).

21112211312 is a wasteful number, since it uses less digits than its factorization.

21112211312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319513215 (or 1319513209 counting only the distinct ones).

The product of its digits is 48, while the sum is 17.

Adding to 21112211312 its reverse (21311221112), we get a palindrome (42423432424).

The spelling of 21112211312 in words is "twenty-one billion, one hundred twelve million, two hundred eleven thousand, three hundred twelve".