21301333220 has 12 divisors (see below), whose sum is σ = 44732799804. Its totient is φ = 8520533280.

The previous prime is 21301333201. The next prime is 21301333243. The reversal of 21301333220 is 2233310312.

It can be written as a sum of positive squares in 2 ways, for example, as 7815620836 + 13485712384 = 88406^2 + 116128^2 .

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: 1065066661 = 21301333220 / (2 + 1 + 3 + 0 + 1 + 3 + 3 + 3 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21301333192 and 21301333201.

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 3 ways as a sum of consecutive naturals, for example, 532533311 + ... + 532533350.

It is an arithmetic number, because the mean of its divisors is an integer number (3727733317).

Almost surely, 2^21301333220 is an apocalyptic number.

21301333220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21301333220 is an abundant number, since it is smaller than the sum of its proper divisors (23431466584).

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

21301333220 is a wasteful number, since it uses less digits than its factorization.

21301333220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065066670 (or 1065066668 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21301333220 its reverse (2233310312), we get a palindrome (23534643532).

The spelling of 21301333220 in words is "twenty-one billion, three hundred one million, three hundred thirty-three thousand, two hundred twenty".