21241222 has 4 divisors (see below), whose sum is σ = 31861836. Its totient is φ = 10620610.

The previous prime is 21241217. The next prime is 21241223. The reversal of 21241222 is 22214212.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21241196 and 21241205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5310304 + ... + 5310307.

It is an arithmetic number, because the mean of its divisors is an integer number (7965459).

Almost surely, 2^21241222 is an apocalyptic number.

21241222 is a deficient number, since it is larger than the sum of its proper divisors (10620614).

21241222 is a wasteful number, since it uses less digits than its factorization.

21241222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10620613.

The product of its digits is 128, while the sum is 16.

The square root of 21241222 is about 4608.8200225220. The cubic root of 21241222 is about 276.9447686672.

Adding to 21241222 its reverse (22214212), we get a palindrome (43455434).

The spelling of 21241222 in words is "twenty-one million, two hundred forty-one thousand, two hundred twenty-two".