21454141 has 4 divisors (see below), whose sum is σ = 21756384. Its totient is φ = 21151900.

The previous prime is 21454123. The next prime is 21454151. The reversal of 21454141 is 14145412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21454141 - 2¹⁵ = 21421373 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

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 (21454151) 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, 151015 + ... + 151156.

It is an arithmetic number, because the mean of its divisors is an integer number (5439096).

Almost surely, 2^21454141 is an apocalyptic number.

It is an amenable number.

21454141 is a deficient number, since it is larger than the sum of its proper divisors (302243).

21454141 is an equidigital number, since it uses as much as digits as its factorization.

21454141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302242.

The product of its digits is 640, while the sum is 22.

The square root of 21454141 is about 4631.8615048380. The cubic root of 21454141 is about 277.8670456146.

Adding to 21454141 its reverse (14145412), we get a palindrome (35599553).

The spelling of 21454141 in words is "twenty-one million, four hundred fifty-four thousand, one hundred forty-one".