21412242 has 16 divisors (see below), whose sum is σ = 47582880. Its totient is φ = 7137396.

The previous prime is 21412219. The next prime is 21412267. The reversal of 21412242 is 24221412.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198208 + ... + 198315.

It is an arithmetic number, because the mean of its divisors is an integer number (2973930).

Almost surely, 2^21412242 is an apocalyptic number.

21412242 is an abundant number, since it is smaller than the sum of its proper divisors (26170638).

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

21412242 is a wasteful number, since it uses less digits than its factorization.

21412242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396534 (or 396528 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 21412242 is about 4627.3363828449. The cubic root of 21412242 is about 277.6860403318.

Adding to 21412242 its reverse (24221412), we get a palindrome (45633654).

The spelling of 21412242 in words is "twenty-one million, four hundred twelve thousand, two hundred forty-two".