21454153 has 8 divisors (see below), whose sum is σ = 25961472. Its totient is φ = 17307456.

The previous prime is 21454151. The next prime is 21454157. The reversal of 21454153 is 35145412.

It is a happy number.

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 21454153 - 2¹ = 21454151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21454151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90025 + ... + 90262.

It is an arithmetic number, because the mean of its divisors is an integer number (3245184).

Almost surely, 2^21454153 is an apocalyptic number.

It is an amenable number.

21454153 is a deficient number, since it is larger than the sum of its proper divisors (4507319).

21454153 is a wasteful number, since it uses less digits than its factorization.

21454153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180311.

The product of its digits is 2400, while the sum is 25.

The square root of 21454153 is about 4631.8628002133. The cubic root of 21454153 is about 277.8670974213.

Adding to 21454153 its reverse (35145412), we get a palindrome (56599565).

The spelling of 21454153 in words is "twenty-one million, four hundred fifty-four thousand, one hundred fifty-three".