21416442 has 16 divisors (see below), whose sum is σ = 44310240. Its totient is φ = 6892592.

The previous prime is 21416431. The next prime is 21416449. The reversal of 21416442 is 24461412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21416449) 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, 61368 + ... + 61715.

It is an arithmetic number, because the mean of its divisors is an integer number (2769390).

Almost surely, 2^21416442 is an apocalyptic number.

21416442 is an abundant number, since it is smaller than the sum of its proper divisors (22893798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21416442 is a wasteful number, since it uses less digits than its factorization.

21416442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123117.

The product of its digits is 1536, while the sum is 24.

The square root of 21416442 is about 4627.7901853909. The cubic root of 21416442 is about 277.7041951350.

Adding to 21416442 its reverse (24461412), we get a palindrome (45877854).

The spelling of 21416442 in words is "twenty-one million, four hundred sixteen thousand, four hundred forty-two".