21304400534 has 8 divisors (see below), whose sum is σ = 32239402920. Its totient is φ = 10557932896.

The previous prime is 21304400531. The next prime is 21304400563. The reversal of 21304400534 is 43500440312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21304400534² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304400531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47133404 + ... + 47133855.

It is an arithmetic number, because the mean of its divisors is an integer number (4029925365).

Almost surely, 2^21304400534 is an apocalyptic number.

21304400534 is a deficient number, since it is larger than the sum of its proper divisors (10935002386).

21304400534 is a wasteful number, since it uses less digits than its factorization.

21304400534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94267374.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 21304400534 its reverse (43500440312), we get a palindrome (64804840846).

The spelling of 21304400534 in words is "twenty-one billion, three hundred four million, four hundred thousand, five hundred thirty-four".