21120021120220 has 48 divisors (see below), whose sum is σ = 48853796479488. Its totient is φ = 7605444490560.

The previous prime is 21120021120181. The next prime is 21120021120229. The reversal of 21120021120220 is 2202112002112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21120021120194 and 21120021120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120021120229) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 465997224 + ... + 466042543.

It is an arithmetic number, because the mean of its divisors is an integer number (1017787426656).

Almost surely, 2^{21120021120220} is an apocalyptic number.

21120021120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120021120220 is an abundant number, since it is smaller than the sum of its proper divisors (27733775359268).

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

21120021120220 is a wasteful number, since it uses less digits than its factorization.

21120021120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932039890 (or 932039888 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120021120220 its reverse (2202112002112), we get a palindrome (23322133122332).

The spelling of 21120021120220 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, one hundred twenty thousand, two hundred twenty".