21416241 has 32 divisors (see below), whose sum is σ = 36062208. Its totient is φ = 10981440.

The previous prime is 21416183. The next prime is 21416281. The reversal of 21416241 is 14261412.

It is a happy number.

It is not a de Polignac number, because 21416241 - 2⁶ = 21416177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21416281) 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 31 ways as a sum of consecutive naturals, for example, 18615 + ... + 19731.

It is an arithmetic number, because the mean of its divisors is an integer number (1126944).

Almost surely, 2^21416241 is an apocalyptic number.

21416241 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21416241 is a deficient number, since it is larger than the sum of its proper divisors (14645967).

21416241 is a wasteful number, since it uses less digits than its factorization.

21416241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221.

The product of its digits is 384, while the sum is 21.

The square root of 21416241 is about 4627.7684687115. The cubic root of 21416241 is about 277.7033263521.

Adding to 21416241 its reverse (14261412), we get a palindrome (35677653).

The spelling of 21416241 in words is "twenty-one million, four hundred sixteen thousand, two hundred forty-one".