21030222220 has 48 divisors (see below), whose sum is σ = 50794067520. Its totient is φ = 7164428544.

The previous prime is 21030222197. The next prime is 21030222221. The reversal of 21030222220 is 2222203012.

It is a junction number, because it is equal to n+sod(n) for n = 21030222194 and 21030222203.

It is not an unprimeable number, because it can be changed into a prime (21030222221) 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, 456415 + ... + 500374.

It is an arithmetic number, because the mean of its divisors is an integer number (1058209740).

Almost surely, 2^21030222220 is an apocalyptic number.

21030222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21030222220 is an abundant number, since it is smaller than the sum of its proper divisors (29763845300).

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

21030222220 is a wasteful number, since it uses less digits than its factorization.

21030222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956962 (or 956960 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21030222220 its reverse (2222203012), we get a palindrome (23252425232).

The spelling of 21030222220 in words is "twenty-one billion, thirty million, two hundred twenty-two thousand, two hundred twenty".