21122221101212 has 48 divisors (see below), whose sum is σ = 46840335360000. Its totient is φ = 8094527985600.

The previous prime is 21122221101109. The next prime is 21122221101257. The reversal of 21122221101212 is 21210112222112.

It is a super-2 number, since 2×21122221101212² (a number of 27 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 (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 562101212 + ... + 562138787.

It is an arithmetic number, because the mean of its divisors is an integer number (975840320000).

Almost surely, 2^{21122221101212} is an apocalyptic number.

21122221101212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21122221101212 is an abundant number, since it is smaller than the sum of its proper divisors (25718114258788).

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

21122221101212 is a wasteful number, since it uses less digits than its factorization.

21122221101212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124240082 (or 1124240080 counting only the distinct ones).

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

Adding to 21122221101212 its reverse (21210112222112), we get a palindrome (42332333323324).

The spelling of 21122221101212 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-one million, one hundred one thousand, two hundred twelve".