21054411 has 40 divisors (see below), whose sum is σ = 36520704. Its totient is φ = 11838960.

The previous prime is 21054403. The next prime is 21054419. The reversal of 21054411 is 11445012.

It is an interprime number because it is at equal distance from previous prime (21054403) and next prime (21054419).

It is not a de Polignac number, because 21054411 - 2³ = 21054403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21054419) 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 39 ways as a sum of consecutive naturals, for example, 39996 + ... + 40518.

Almost surely, 2^21054411 is an apocalyptic number.

21054411 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21054411 is a deficient number, since it is larger than the sum of its proper divisors (15466293).

21054411 is an equidigital number, since it uses as much as digits as its factorization.

21054411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 21054411 is about 4588.5085812277. The cubic root of 21054411 is about 276.1304912248.

Adding to 21054411 its reverse (11445012), we get a palindrome (32499423).

The spelling of 21054411 in words is "twenty-one million, fifty-four thousand, four hundred eleven".