21222010020 has 24 divisors (see below), whose sum is σ = 59421628224. Its totient is φ = 5659202656.

The previous prime is 21222010013. The next prime is 21222010097. The reversal of 21222010020 is 2001022212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21222009978 and 21222010005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176850024 + ... + 176850143.

It is an arithmetic number, because the mean of its divisors is an integer number (2475901176).

Almost surely, 2^21222010020 is an apocalyptic number.

21222010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222010020 is an abundant number, since it is smaller than the sum of its proper divisors (38199618204).

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

21222010020 is a wasteful number, since it uses less digits than its factorization.

21222010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353700179 (or 353700177 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21222010020 its reverse (2001022212), we get a palindrome (23223032232).

The spelling of 21222010020 in words is "twenty-one billion, two hundred twenty-two million, ten thousand, twenty".