21202102222020 has 120 divisors (see below), whose sum is σ = 67639098542400. Its totient is φ = 5558065190208.

The previous prime is 21202102222001. The next prime is 21202102222027. The reversal of 21202102222020 is 2022220120212.

21202102222020 is a `hidden beast` number, since 212 + 0 + 210 + 2 + 2 + 220 + 20 = 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 = 21202102221984 and 21202102222002.

It is not an unprimeable number, because it can be changed into a prime (21202102222027) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 110817280 + ... + 111008439.

It is an arithmetic number, because the mean of its divisors is an integer number (563659154520).

Almost surely, 2^{21202102222020} is an apocalyptic number.

21202102222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202102222020 is an abundant number, since it is smaller than the sum of its proper divisors (46436996320380).

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

21202102222020 is a wasteful number, since it uses less digits than its factorization.

21202102222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221825799 (or 221825788 counting only the distinct ones).

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

Adding to 21202102222020 its reverse (2022220120212), we get a palindrome (23224322342232).

The spelling of 21202102222020 in words is "twenty-one trillion, two hundred two billion, one hundred two million, two hundred twenty-two thousand, twenty".