21414242 has 16 divisors (see below), whose sum is σ = 34601472. Its totient is φ = 9910560.

The previous prime is 21414241. The next prime is 21414257. The reversal of 21414242 is 24241412.

It is a super-3 number, since 3×21414242³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21414241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6083 + ... + 8934.

It is an arithmetic number, because the mean of its divisors is an integer number (2162592).

Almost surely, 2^21414242 is an apocalyptic number.

21414242 is a deficient number, since it is larger than the sum of its proper divisors (13187230).

21414242 is a wasteful number, since it uses less digits than its factorization.

21414242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15073.

The product of its digits is 512, while the sum is 20.

The square root of 21414242 is about 4627.5524848455. The cubic root of 21414242 is about 277.6946857723.

Adding to 21414242 its reverse (24241412), we get a palindrome (45655654).

The spelling of 21414242 in words is "twenty-one million, four hundred fourteen thousand, two hundred forty-two".