21320100304 has 10 divisors (see below), whose sum is σ = 41307694370. Its totient is φ = 10660050144.

The previous prime is 21320100293. The next prime is 21320100343. The reversal of 21320100304 is 40300102312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14103937600 + 7216162704 = 118760^2 + 84948^2 .

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 1332506269 = 21320100304 / (2 + 1 + 3 + 2 + 0 + 1 + 0 + 0 + 3 + 0 + 4).

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 as a sum of consecutive naturals, namely, 666253119 + ... + 666253150.

It is an arithmetic number, because the mean of its divisors is an integer number (4130769437).

Almost surely, 2^21320100304 is an apocalyptic number.

It is an amenable number.

21320100304 is a deficient number, since it is larger than the sum of its proper divisors (19987594066).

21320100304 is a wasteful number, since it uses less digits than its factorization.

21320100304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332506277 (or 1332506271 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21320100304 its reverse (40300102312), we get a palindrome (61620202616).

The spelling of 21320100304 in words is "twenty-one billion, three hundred twenty million, one hundred thousand, three hundred four".