21454267 has 4 divisors (see below), whose sum is σ = 21725920. Its totient is φ = 21182616.

The previous prime is 21454261. The next prime is 21454297. The reversal of 21454267 is 76245412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21454267 - 2¹¹ = 21452219 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21454261) 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, 135708 + ... + 135865.

It is an arithmetic number, because the mean of its divisors is an integer number (5431480).

Almost surely, 2^21454267 is an apocalyptic number.

21454267 is a deficient number, since it is larger than the sum of its proper divisors (271653).

21454267 is an equidigital number, since it uses as much as digits as its factorization.

21454267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271652.

The product of its digits is 13440, while the sum is 31.

The square root of 21454267 is about 4631.8751062610. The cubic root of 21454267 is about 277.8675895839.

Adding to 21454267 its reverse (76245412), we get a palindrome (97699679).

The spelling of 21454267 in words is "twenty-one million, four hundred fifty-four thousand, two hundred sixty-seven".