21120121102220 has 24 divisors (see below), whose sum is σ = 50688290645664. Its totient is φ = 7241184377856.

The previous prime is 21120121102147. The next prime is 21120121102259. The reversal of 21120121102220 is 2220112102112.

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 7 ways as a sum of consecutive naturals, for example, 75429003797 + ... + 75429004076.

It is an arithmetic number, because the mean of its divisors is an integer number (2112012110236).

Almost surely, 2^{21120121102220} is an apocalyptic number.

21120121102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120121102220 is an abundant number, since it is smaller than the sum of its proper divisors (29568169543444).

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

21120121102220 is a wasteful number, since it uses less digits than its factorization.

21120121102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150858007889 (or 150858007887 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21120121102220 its reverse (2220112102112), we get a palindrome (23340233204332).

The spelling of 21120121102220 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty".