21202012222220 has 12 divisors (see below), whose sum is σ = 44524225666704. Its totient is φ = 8480804888880.

The previous prime is 21202012222217. The next prime is 21202012222267. The reversal of 21202012222220 is 2222221020212.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1060100611111 = 21202012222220 / (2 + 1 + 2 + 0 + 2 + 0 + 1 + 2 + 2 + 2 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21202012222192 and 21202012222201.

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 3 ways as a sum of consecutive naturals, for example, 530050305536 + ... + 530050305575.

It is an arithmetic number, because the mean of its divisors is an integer number (3710352138892).

Almost surely, 2^{21202012222220} is an apocalyptic number.

21202012222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202012222220 is an abundant number, since it is smaller than the sum of its proper divisors (23322213444484).

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

21202012222220 is a wasteful number, since it uses less digits than its factorization.

21202012222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060100611120 (or 1060100611118 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21202012222220 its reverse (2222221020212), we get a palindrome (23424233242432).

The spelling of 21202012222220 in words is "twenty-one trillion, two hundred two billion, twelve million, two hundred twenty-two thousand, two hundred twenty".