21417222 has 32 divisors (see below), whose sum is σ = 43925760. Its totient is φ = 6959520.

The previous prime is 21417203. The next prime is 21417233. The reversal of 21417222 is 22271412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59479 + ... + 59837.

It is an arithmetic number, because the mean of its divisors is an integer number (1372680).

Almost surely, 2^21417222 is an apocalyptic number.

21417222 is an abundant number, since it is smaller than the sum of its proper divisors (22508538).

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

21417222 is a wasteful number, since it uses less digits than its factorization.

21417222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588.

The product of its digits is 448, while the sum is 21.

The square root of 21417222 is about 4627.8744581071. The cubic root of 21417222 is about 277.7075664800.

Adding to 21417222 its reverse (22271412), we get a palindrome (43688634).

It can be divided in two parts, 21417 and 222, that multiplied together give a palindrome (4754574).

The spelling of 21417222 in words is "twenty-one million, four hundred seventeen thousand, two hundred twenty-two".