21022221020202 has 192 divisors, whose sum is σ = 50896154050560. Its totient is φ = 6484304534400.

The previous prime is 21022221020183. The next prime is 21022221020221. The reversal of 21022221020202 is 20202012222012.

21022221020202 is a `hidden beast` number, since 2 + 10 + 222 + 210 + 20 + 202 = 666.

It is an interprime number because it is at equal distance from previous prime (21022221020183) and next prime (21022221020221).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1222853427 + ... + 1222870617.

It is an arithmetic number, because the mean of its divisors is an integer number (265084135680).

Almost surely, 2^{21022221020202} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022221020202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25448077025280).

21022221020202 is an abundant number, since it is smaller than the sum of its proper divisors (29873933030358).

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

21022221020202 is a wasteful number, since it uses less digits than its factorization.

21022221020202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20791 (or 20779 counting only the distinct ones).

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

Adding to 21022221020202 its reverse (20202012222012), we get a palindrome (41224233242214).

The spelling of 21022221020202 in words is "twenty-one trillion, twenty-two billion, two hundred twenty-one million, twenty thousand, two hundred two".