21354454 has 8 divisors (see below), whose sum is σ = 34943688. Its totient is φ = 9706560.

The previous prime is 21354451. The next prime is 21354551. The reversal of 21354454 is 45445312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354451) 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, 485307 + ... + 485350.

It is an arithmetic number, because the mean of its divisors is an integer number (4367961).

Almost surely, 2^21354454 is an apocalyptic number.

21354454 is a deficient number, since it is larger than the sum of its proper divisors (13589234).

21354454 is a wasteful number, since it uses less digits than its factorization.

21354454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970670.

The product of its digits is 9600, while the sum is 28.

The square root of 21354454 is about 4621.0879671350. The cubic root of 21354454 is about 277.4360061294.

Adding to 21354454 its reverse (45445312), we get a palindrome (66799766).

The spelling of 21354454 in words is "twenty-one million, three hundred fifty-four thousand, four hundred fifty-four".