21204134030 has 16 divisors (see below), whose sum is σ = 38186763120. Its totient is φ = 8477359872.

The previous prime is 21204133999. The next prime is 21204134047. The reversal of 21204134030 is 3043140212.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21204133993 and 21204134011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515939 + ... + 555518.

It is an arithmetic number, because the mean of its divisors is an integer number (2386672695).

Almost surely, 2^21204134030 is an apocalyptic number.

21204134030 is a deficient number, since it is larger than the sum of its proper divisors (16982629090).

21204134030 is a wasteful number, since it uses less digits than its factorization.

21204134030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073443.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21204134030 its reverse (3043140212), we get a palindrome (24247274242).

The spelling of 21204134030 in words is "twenty-one billion, two hundred four million, one hundred thirty-four thousand, thirty".