21223412213212 has 48 divisors (see below), whose sum is σ = 40559742332928. Its totient is φ = 9636932214720.

The previous prime is 21223412213203. The next prime is 21223412213233. The reversal of 21223412213212 is 21231221432212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373840453 + ... + 373897219.

It is an arithmetic number, because the mean of its divisors is an integer number (844994631936).

Almost surely, 2^{21223412213212} is an apocalyptic number.

21223412213212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21223412213212 is a deficient number, since it is larger than the sum of its proper divisors (19336330119716).

21223412213212 is a wasteful number, since it uses less digits than its factorization.

21223412213212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65506 (or 65504 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

Adding to 21223412213212 its reverse (21231221432212), we get a palindrome (42454633645424).

The spelling of 21223412213212 in words is "twenty-one trillion, two hundred twenty-three billion, four hundred twelve million, two hundred thirteen thousand, two hundred twelve".