21543141 has 8 divisors (see below), whose sum is σ = 28752480. Its totient is φ = 14347952.

The previous prime is 21543133. The next prime is 21543173. The reversal of 21543141 is 14134512.

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 21543141 - 2³ = 21543133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21543101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 766 + ... + 6608.

It is an arithmetic number, because the mean of its divisors is an integer number (3594060).

Almost surely, 2^21543141 is an apocalyptic number.

It is an amenable number.

21543141 is a deficient number, since it is larger than the sum of its proper divisors (7209339).

21543141 is a wasteful number, since it uses less digits than its factorization.

21543141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7075.

The product of its digits is 480, while the sum is 21.

The square root of 21543141 is about 4641.4589301210. The cubic root of 21543141 is about 278.2507485233.

Adding to 21543141 its reverse (14134512), we get a palindrome (35677653).

The spelling of 21543141 in words is "twenty-one million, five hundred forty-three thousand, one hundred forty-one".