21114242 has 8 divisors (see below), whose sum is σ = 31694736. Its totient is φ = 10549332.

The previous prime is 21114241. The next prime is 21114257. The reversal of 21114242 is 24241112.

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

It is a super-2 number, since 2×21114242² = 891622430469128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21114242.

It is not an unprimeable number, because it can be changed into a prime (21114241) 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, 473 + ... + 6515.

It is an arithmetic number, because the mean of its divisors is an integer number (3961842).

Almost surely, 2^21114242 is an apocalyptic number.

21114242 is a deficient number, since it is larger than the sum of its proper divisors (10580494).

21114242 is a wasteful number, since it uses less digits than its factorization.

21114242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7792.

The product of its digits is 128, while the sum is 17.

The square root of 21114242 is about 4595.0236125617. The cubic root of 21114242 is about 276.3918068308.

Adding to 21114242 its reverse (24241112), we get a palindrome (45355354).

The spelling of 21114242 in words is "twenty-one million, one hundred fourteen thousand, two hundred forty-two".