21202103304 has 48 divisors (see below), whose sum is σ = 58363725420. Its totient is φ = 6951507840.

The previous prime is 21202103291. The next prime is 21202103309. The reversal of 21202103304 is 40330120212.

21202103304 is a `hidden beast` number, since 2 + 120 + 210 + 330 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21199942404 + 2160900 = 145602^2 + 1470^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21202103309) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2409327 + ... + 2418110.

Almost surely, 2^21202103304 is an apocalyptic number.

21202103304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21202103304 is an abundant number, since it is smaller than the sum of its proper divisors (37161622116).

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

21202103304 is a wasteful number, since it uses less digits than its factorization.

21202103304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4827510 (or 4827503 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21202103304 its reverse (40330120212), we get a palindrome (61532223516).

The spelling of 21202103304 in words is "twenty-one billion, two hundred two million, one hundred three thousand, three hundred four".