21341523 has 8 divisors (see below), whose sum is σ = 32520448. Its totient is φ = 12195144.

The previous prime is 21341501. The next prime is 21341527. The reversal of 21341523 is 32514312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21341523 - 2⁵ = 21341491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1016263 = 21341523 / (2 + 1 + 3 + 4 + 1 + 5 + 2 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21341523.

It is not an unprimeable number, because it can be changed into a prime (21341527) 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, 508111 + ... + 508152.

It is an arithmetic number, because the mean of its divisors is an integer number (4065056).

Almost surely, 2^21341523 is an apocalyptic number.

21341523 is a deficient number, since it is larger than the sum of its proper divisors (11178925).

21341523 is a wasteful number, since it uses less digits than its factorization.

21341523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016273.

The product of its digits is 720, while the sum is 21.

The square root of 21341523 is about 4619.6886258708. The cubic root of 21341523 is about 277.3799951855.

Adding to 21341523 its reverse (32514312), we get a palindrome (53855835).

The spelling of 21341523 in words is "twenty-one million, three hundred forty-one thousand, five hundred twenty-three".