21304054434 has 32 divisors (see below), whose sum is σ = 46637889984. Its totient is φ = 6447631680.

The previous prime is 21304054433. The next prime is 21304054477. The reversal of 21304054434 is 43445040312.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21304054433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2234004 + ... + 2243519.

It is an arithmetic number, because the mean of its divisors is an integer number (1457434062).

Almost surely, 2^21304054434 is an apocalyptic number.

21304054434 is an abundant number, since it is smaller than the sum of its proper divisors (25333835550).

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

21304054434 is a wasteful number, since it uses less digits than its factorization.

21304054434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4477602.

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 21304054434 its reverse (43445040312), we get a palindrome (64749094746).

The spelling of 21304054434 in words is "twenty-one billion, three hundred four million, fifty-four thousand, four hundred thirty-four".