21454899 has 8 divisors (see below), whose sum is σ = 28968960. Its totient is φ = 14122056.

The previous prime is 21454897. The next prime is 21454903. The reversal of 21454899 is 99845412.

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

It is not a de Polignac number, because 21454899 - 2¹ = 21454897 is a prime.

It is a super-2 number, since 2×21454899² = 920625382200402, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21454899.

It is not an unprimeable number, because it can be changed into a prime (21454897) 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 7 ways as a sum of consecutive naturals, for example, 45027 + ... + 45500.

It is an arithmetic number, because the mean of its divisors is an integer number (3621120).

Almost surely, 2^21454899 is an apocalyptic number.

21454899 is a deficient number, since it is larger than the sum of its proper divisors (7514061).

21454899 is an equidigital number, since it uses as much as digits as its factorization.

21454899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90609.

The product of its digits is 103680, while the sum is 42.

The square root of 21454899 is about 4631.9433286689. The cubic root of 21454899 is about 277.8703180324.

The spelling of 21454899 in words is "twenty-one million, four hundred fifty-four thousand, eight hundred ninety-nine".