21541124 has 12 divisors (see below), whose sum is σ = 41124048. Its totient is φ = 9791400.

The previous prime is 21541099. The next prime is 21541127. The reversal of 21541124 is 42114512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21541096 and 21541105.

It is not an unprimeable number, because it can be changed into a prime (21541127) 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, 244742 + ... + 244829.

It is an arithmetic number, because the mean of its divisors is an integer number (3427004).

Almost surely, 2^21541124 is an apocalyptic number.

It is an amenable number.

21541124 is a deficient number, since it is larger than the sum of its proper divisors (19582924).

21541124 is a wasteful number, since it uses less digits than its factorization.

21541124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489586 (or 489584 counting only the distinct ones).

The product of its digits is 320, while the sum is 20.

The square root of 21541124 is about 4641.2416442155. The cubic root of 21541124 is about 278.2420644094.

Adding to 21541124 its reverse (42114512), we get a palindrome (63655636).

It can be divided in two parts, 21 and 541124, that added together give a palindrome (541145).

The spelling of 21541124 in words is "twenty-one million, five hundred forty-one thousand, one hundred twenty-four".