21316454 has 8 divisors (see below), whose sum is σ = 32291568. Its totient is φ = 10552600.

The previous prime is 21316417. The next prime is 21316459. The reversal of 21316454 is 45461312.

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

It is a super-2 number, since 2×21316454² = 908782422268232, which contains 22 as substring.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21316459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52562 + ... + 52965.

It is an arithmetic number, because the mean of its divisors is an integer number (4036446).

Almost surely, 2^21316454 is an apocalyptic number.

21316454 is a deficient number, since it is larger than the sum of its proper divisors (10975114).

21316454 is a wasteful number, since it uses less digits than its factorization.

21316454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105630.

The product of its digits is 2880, while the sum is 26.

The square root of 21316454 is about 4616.9745505038. The cubic root of 21316454 is about 277.2713437146.

Adding to 21316454 its reverse (45461312), we get a palindrome (66777766).

The spelling of 21316454 in words is "twenty-one million, three hundred sixteen thousand, four hundred fifty-four".