21304054453 has 8 divisors (see below), whose sum is σ = 23990489856. Its totient is φ = 18742569600.

The previous prime is 21304054433. The next prime is 21304054477. The reversal of 21304054453 is 35445040312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21304054453 is a prime.

It is a super-2 number, since 2×21304054453² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 31237276 + ... + 31237957.

It is an arithmetic number, because the mean of its divisors is an integer number (2998811232).

Almost surely, 2^21304054453 is an apocalyptic number.

It is an amenable number.

21304054453 is a deficient number, since it is larger than the sum of its proper divisors (2686435403).

21304054453 is a wasteful number, since it uses less digits than its factorization.

21304054453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62475275.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 21304054453 its reverse (35445040312), we get a palindrome (56749094765).

The spelling of 21304054453 in words is "twenty-one billion, three hundred four million, fifty-four thousand, four hundred fifty-three".