21443153 has 8 divisors (see below), whose sum is σ = 23553600. Its totient is φ = 19430928.

The previous prime is 21443141. The next prime is 21443159. The reversal of 21443153 is 35134412.

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 21443153 - 2²² = 17248849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443159) 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, 24098 + ... + 24971.

It is an arithmetic number, because the mean of its divisors is an integer number (2944200).

Almost surely, 2^21443153 is an apocalyptic number.

21443153 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21443153 is a deficient number, since it is larger than the sum of its proper divisors (2110447).

21443153 is a wasteful number, since it uses less digits than its factorization.

21443153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49111.

The product of its digits is 1440, while the sum is 23.

The square root of 21443153 is about 4630.6752207427. The cubic root of 21443153 is about 277.8195998482.

Adding to 21443153 its reverse (35134412), we get a palindrome (56577565).

The spelling of 21443153 in words is "twenty-one million, four hundred forty-three thousand, one hundred fifty-three".