21220202122020 has 144 divisors (see below), whose sum is σ = 70225611543360. Its totient is φ = 5143849401600.

The previous prime is 21220202121967. The next prime is 21220202122079. The reversal of 21220202122020 is 2022120202212.

21220202122020 is a `hidden beast` number, since 2 + 1 + 220 + 202 + 1 + 220 + 20 = 666.

It is a super-2 number, since 2×21220202122020² (a number of 27 digits) contains 22 as substring.

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 = 21220202121984 and 21220202122002.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22887675 + ... + 23796765.

It is an arithmetic number, because the mean of its divisors is an integer number (487677857940).

Almost surely, 2^{21220202122020} is an apocalyptic number.

21220202122020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220202122020 is an abundant number, since it is smaller than the sum of its proper divisors (49005409421340).

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

21220202122020 is a wasteful number, since it uses less digits than its factorization.

21220202122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920906 (or 920901 counting only the distinct ones).

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

Adding to 21220202122020 its reverse (2022120202212), we get a palindrome (23242322324232).

The spelling of 21220202122020 in words is "twenty-one trillion, two hundred twenty billion, two hundred two million, one hundred twenty-two thousand, twenty".