21011221222112 has 96 divisors (see below), whose sum is σ = 49428481828320. Its totient is φ = 8678800506880.

The previous prime is 21011221222081. The next prime is 21011221222133. The reversal of 21011221222112 is 21122212211012.

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 15 ways as a sum of consecutive naturals, for example, 60364973 + ... + 60712044.

It is an arithmetic number, because the mean of its divisors is an integer number (514880019045).

Almost surely, 2^{21011221222112} is an apocalyptic number.

21011221222112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21011221222112 is an abundant number, since it is smaller than the sum of its proper divisors (28417260606208).

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

21011221222112 is a wasteful number, since it uses less digits than its factorization.

21011221222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121077084 (or 121077076 counting only the distinct ones).

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

Adding to 21011221222112 its reverse (21122212211012), we get a palindrome (42133433433124).

The spelling of 21011221222112 in words is "twenty-one trillion, eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred twelve".