21454919 has 8 divisors (see below), whose sum is σ = 22017072. Its totient is φ = 20900160.

The previous prime is 21454903. The next prime is 21454943. The reversal of 21454919 is 91945412.

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

It is a cyclic number.

It is not a de Polignac number, because 21454919 - 2⁴ = 21454903 is a prime.

It is a super-2 number, since 2×21454919² = 920627098593122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454949) 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, 4289 + ... + 7829.

It is an arithmetic number, because the mean of its divisors is an integer number (2752134).

Almost surely, 2^21454919 is an apocalyptic number.

21454919 is a deficient number, since it is larger than the sum of its proper divisors (562153).

21454919 is an equidigital number, since it uses as much as digits as its factorization.

21454919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3697.

The product of its digits is 12960, while the sum is 35.

The square root of 21454919 is about 4631.9454875894. The cubic root of 21454919 is about 277.8704043749.

The spelling of 21454919 in words is "twenty-one million, four hundred fifty-four thousand, nine hundred nineteen".