21120411 has 8 divisors (see below), whose sum is σ = 30326800. Its totient is φ = 12997152.

The previous prime is 21120403. The next prime is 21120427. The reversal of 21120411 is 11402112.

It is a happy number.

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

It is not a de Polignac number, because 21120411 - 2³ = 21120403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120431) 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, 270736 + ... + 270813.

It is an arithmetic number, because the mean of its divisors is an integer number (3790850).

Almost surely, 2^21120411 is an apocalyptic number.

21120411 is a deficient number, since it is larger than the sum of its proper divisors (9206389).

21120411 is a wasteful number, since it uses less digits than its factorization.

21120411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541565.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 21120411 is about 4595.6948332108. The cubic root of 21120411 is about 276.4187222342.

Adding to 21120411 its reverse (11402112), we get a palindrome (32522523).

The spelling of 21120411 in words is "twenty-one million, one hundred twenty thousand, four hundred eleven".