21541411 has 4 divisors (see below), whose sum is σ = 21551832. Its totient is φ = 21530992.

The previous prime is 21541391. The next prime is 21541417. The reversal of 21541411 is 11414512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21541411 - 2⁵ = 21541379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21541417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 946 + ... + 6631.

It is an arithmetic number, because the mean of its divisors is an integer number (5387958).

Almost surely, 2^21541411 is an apocalyptic number.

21541411 is a deficient number, since it is larger than the sum of its proper divisors (10421).

21541411 is an equidigital number, since it uses as much as digits as its factorization.

21541411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10420.

The product of its digits is 160, while the sum is 19.

The square root of 21541411 is about 4641.2725625630. The cubic root of 21541411 is about 278.2433001096.

Adding to 21541411 its reverse (11414512), we get a palindrome (32955923).

It can be divided in two parts, 21541 and 411, that added together give a cube (21952 = 28³).

The spelling of 21541411 in words is "twenty-one million, five hundred forty-one thousand, four hundred eleven".