21523141 has 8 divisors (see below), whose sum is σ = 22304160. Its totient is φ = 20756112.

The previous prime is 21523093. The next prime is 21523171. The reversal of 21523141 is 14132512.

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 21523141 - 2¹⁹ = 20998853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523171) 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, 315 + ... + 6568.

It is an arithmetic number, because the mean of its divisors is an integer number (2788020).

Almost surely, 2^21523141 is an apocalyptic number.

It is an amenable number.

21523141 is a deficient number, since it is larger than the sum of its proper divisors (781019).

21523141 is an equidigital number, since it uses as much as digits as its factorization.

21523141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6995.

The product of its digits is 240, while the sum is 19.

The square root of 21523141 is about 4639.3039348592. The cubic root of 21523141 is about 278.1646153392.

Adding to 21523141 its reverse (14132512), we get a palindrome (35655653).

The spelling of 21523141 in words is "twenty-one million, five hundred twenty-three thousand, one hundred forty-one".