21202022120120 has 64 divisors (see below), whose sum is σ = 48280651413120. Its totient is φ = 8378396486784.

The previous prime is 21202022120089. The next prime is 21202022120129. The reversal of 21202022120120 is 2102122020212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202022120129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164697299 + ... + 164825981.

It is an arithmetic number, because the mean of its divisors is an integer number (754385178330).

Almost surely, 2^{21202022120120} is an apocalyptic number.

21202022120120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202022120120 is an abundant number, since it is smaller than the sum of its proper divisors (27078629293000).

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

21202022120120 is a wasteful number, since it uses less digits than its factorization.

21202022120120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178404 (or 178400 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21202022120120 its reverse (2102122020212), we get a palindrome (23304144140332).

The spelling of 21202022120120 in words is "twenty-one trillion, two hundred two billion, twenty-two million, one hundred twenty thousand, one hundred twenty".