21202210022020 has 48 divisors (see below), whose sum is σ = 44592281815536. Its totient is φ = 8468009280000.

The previous prime is 21202210022009. The next prime is 21202210022023. The reversal of 21202210022020 is 2022001220212.

It can be written as a sum of positive squares in 8 ways, for example, as 8641154093056 + 12561055928964 = 2939584^2 + 3544158^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21202210021985 and 21202210022003.

It is not an unprimeable number, because it can be changed into a prime (21202210022023) 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, 36657070 + ... + 37230970.

It is an arithmetic number, because the mean of its divisors is an integer number (929005871157).

Almost surely, 2^{21202210022020} is an apocalyptic number.

21202210022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202210022020 is an abundant number, since it is smaller than the sum of its proper divisors (23390071793516).

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

21202210022020 is a wasteful number, since it uses less digits than its factorization.

21202210022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576712 (or 576710 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21202210022020 its reverse (2022001220212), we get a palindrome (23224211242232).

The spelling of 21202210022020 in words is "twenty-one trillion, two hundred two billion, two hundred ten million, twenty-two thousand, twenty".