21200020022120 has 32 divisors (see below), whose sum is σ = 50210573738400. Its totient is φ = 8033691797568.

The previous prime is 21200020022099. The next prime is 21200020022131. The reversal of 21200020022120 is 2122002000212.

It is a junction number, because it is equal to n+sod(n) for n = 21200020022095 and 21200020022104.

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, 13947380834 + ... + 13947382353.

It is an arithmetic number, because the mean of its divisors is an integer number (1569080429325).

Almost surely, 2^{21200020022120} is an apocalyptic number.

21200020022120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200020022120 is an abundant number, since it is smaller than the sum of its proper divisors (29010553716280).

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

21200020022120 is a wasteful number, since it uses less digits than its factorization.

21200020022120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27894763217 (or 27894763213 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21200020022120 its reverse (2122002000212), we get a palindrome (23322022022332).

The spelling of 21200020022120 in words is "twenty-one trillion, two hundred billion, twenty million, twenty-two thousand, one hundred twenty".