21202220012220 has 120 divisors (see below), whose sum is σ = 71628468705024. Its totient is φ = 5219007997824.

The previous prime is 21202220012213. The next prime is 21202220012251. The reversal of 21202220012220 is 2221002220212.

21202220012220 is a `hidden beast` number, since 21 + 202 + 220 + 0 + 1 + 2 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21202220012193 and 21202220012202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 503355484 + ... + 503397603.

Almost surely, 2^{21202220012220} is an apocalyptic number.

21202220012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202220012220 is an abundant number, since it is smaller than the sum of its proper divisors (50426248692804).

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

21202220012220 is a wasteful number, since it uses less digits than its factorization.

21202220012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006753121 (or 1006753110 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21202220012220 its reverse (2221002220212), we get a palindrome (23423222232432).

The spelling of 21202220012220 in words is "twenty-one trillion, two hundred two billion, two hundred twenty million, twelve thousand, two hundred twenty".