21112221012220 has 96 divisors (see below), whose sum is σ = 50557122000000. Its totient is φ = 7336383258624.

The previous prime is 21112221012217. The next prime is 21112221012299. The reversal of 21112221012220 is 2221012221112.

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 31 ways as a sum of consecutive naturals, for example, 102259656 + ... + 102465904.

It is an arithmetic number, because the mean of its divisors is an integer number (526636687500).

Almost surely, 2^{21112221012220} is an apocalyptic number.

21112221012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112221012220 is an abundant number, since it is smaller than the sum of its proper divisors (29444900987780).

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

21112221012220 is a wasteful number, since it uses less digits than its factorization.

21112221012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229447 (or 229445 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21112221012220 its reverse (2221012221112), we get a palindrome (23333233233332).

The spelling of 21112221012220 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, twelve thousand, two hundred twenty".