21122220012220 has 24 divisors (see below), whose sum is σ = 44364814553808. Its totient is φ = 8447335142400.

The previous prime is 21122220012197. The next prime is 21122220012241. The reversal of 21122220012220 is 2221002222112.

It is a super-2 number, since 2×21122220012220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96942366 + ... + 97160005.

It is an arithmetic number, because the mean of its divisors is an integer number (1848533939742).

Almost surely, 2^{21122220012220} is an apocalyptic number.

21122220012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122220012220 is an abundant number, since it is smaller than the sum of its proper divisors (23242594541588).

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

21122220012220 is a wasteful number, since it uses less digits than its factorization.

21122220012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194107821 (or 194107819 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21122220012220 its reverse (2221002222112), we get a palindrome (23343222234332).

The spelling of 21122220012220 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty million, twelve thousand, two hundred twenty".