21304104210 has 96 divisors (see below), whose sum is σ = 56463337008. Its totient is φ = 5571624960.

The previous prime is 21304104209. The next prime is 21304104229. The reversal of 21304104210 is 1240140312.

21304104210 is a `hidden beast` number, since 213 + 0 + 410 + 42 + 1 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 706974921 + 20597129289 = 26589^2 + 143517^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1932474 + ... + 1943466.

Almost surely, 2^21304104210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21304104210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28231668504).

21304104210 is an abundant number, since it is smaller than the sum of its proper divisors (35159232798).

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

21304104210 is a wasteful number, since it uses less digits than its factorization.

21304104210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11420 (or 11417 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21304104210 its reverse (1240140312), we get a palindrome (22544244522).

The spelling of 21304104210 in words is "twenty-one billion, three hundred four million, one hundred four thousand, two hundred ten".