21121002000220 has 24 divisors (see below), whose sum is σ = 44356623771600. Its totient is φ = 8447920881792.

The previous prime is 21121002000187. The next prime is 21121002000223. The reversal of 21121002000220 is 2200020012112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121002000220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121002000223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29633910 + ... + 30338269.

It is an arithmetic number, because the mean of its divisors is an integer number (1848192657150).

Almost surely, 2^{21121002000220} is an apocalyptic number.

21121002000220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121002000220 is an abundant number, since it is smaller than the sum of its proper divisors (23235621771380).

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

21121002000220 is a wasteful number, since it uses less digits than its factorization.

21121002000220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59989797 (or 59989795 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21121002000220 its reverse (2200020012112), we get a palindrome (23321022012332).

The spelling of 21121002000220 in words is "twenty-one trillion, one hundred twenty-one billion, two million, two hundred twenty", and thus it is an aban number.