21302220020 has 12 divisors (see below), whose sum is σ = 44734662084. Its totient is φ = 8520888000.

The previous prime is 21302220013. The next prime is 21302220041. The reversal of 21302220020 is 2002220312.

It can be written as a sum of positive squares in 2 ways, for example, as 5517815524 + 15784404496 = 74282^2 + 125636^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21302219977 and 21302220004.

It is a congruent number.

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, 532555481 + ... + 532555520.

It is an arithmetic number, because the mean of its divisors is an integer number (3727888507).

Almost surely, 2^21302220020 is an apocalyptic number.

21302220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21302220020 is an abundant number, since it is smaller than the sum of its proper divisors (23432442064).

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

21302220020 is a wasteful number, since it uses less digits than its factorization.

21302220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065111010 (or 1065111008 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 21302220020 its reverse (2002220312), we get a palindrome (23304440332).

The spelling of 21302220020 in words is "twenty-one billion, three hundred two million, two hundred twenty thousand, twenty".