21303243220 has 48 divisors (see below), whose sum is σ = 51289176960. Its totient is φ = 7280913024.

The previous prime is 21303243211. The next prime is 21303243233. The reversal of 21303243220 is 2234230312.

It is a junction number, because it is equal to n+sod(n) for n = 21303243191 and 21303243200.

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 15 ways as a sum of consecutive naturals, for example, 195630 + ... + 284389.

It is an arithmetic number, because the mean of its divisors is an integer number (1068524520).

Almost surely, 2^21303243220 is an apocalyptic number.

21303243220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21303243220 is an abundant number, since it is smaller than the sum of its proper divisors (29985933740).

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

21303243220 is a wasteful number, since it uses less digits than its factorization.

21303243220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480352 (or 480350 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21303243220 its reverse (2234230312), we get a palindrome (23537473532).

The spelling of 21303243220 in words is "twenty-one billion, three hundred three million, two hundred forty-three thousand, two hundred twenty".