21210211222112 has 48 divisors (see below), whose sum is σ = 45630568689552. Its totient is φ = 9624746987520.

The previous prime is 21210211222087. The next prime is 21210211222127. The reversal of 21210211222112 is 21122211201212.

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 in 7 ways as a sum of consecutive naturals, for example, 50597573 + ... + 51015044.

It is an arithmetic number, because the mean of its divisors is an integer number (950636847699).

Almost surely, 2^{21210211222112} is an apocalyptic number.

21210211222112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21210211222112 is an abundant number, since it is smaller than the sum of its proper divisors (24420357467440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210211222112 is a wasteful number, since it uses less digits than its factorization.

21210211222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101613231 (or 101613223 counting only the distinct ones).

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

Adding to 21210211222112 its reverse (21122211201212), we get a palindrome (42332422423324).

The spelling of 21210211222112 in words is "twenty-one trillion, two hundred ten billion, two hundred eleven million, two hundred twenty-two thousand, one hundred twelve".