21210212111222 has 8 divisors (see below), whose sum is σ = 31976817244416. Its totient is φ = 10551273029752.

The previous prime is 21210212111113. The next prime is 21210212111227. The reversal of 21210212111222 is 22211121201212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21210212111194 and 21210212111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210212111227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26916512438 + ... + 26916513225.

It is an arithmetic number, because the mean of its divisors is an integer number (3997102155552).

Almost surely, 2^{21210212111222} is an apocalyptic number.

21210212111222 is a deficient number, since it is larger than the sum of its proper divisors (10766605133194).

21210212111222 is a wasteful number, since it uses less digits than its factorization.

21210212111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53833025862.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21210212111222 its reverse (22211121201212), we get a palindrome (43421333312434).

The spelling of 21210212111222 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty-two".