21422422 has 8 divisors (see below), whose sum is σ = 36724176. Its totient is φ = 9181032.

The previous prime is 21422419. The next prime is 21422449. The reversal of 21422422 is 22422412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21422422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765073 + ... + 765100.

It is an arithmetic number, because the mean of its divisors is an integer number (4590522).

Almost surely, 2^21422422 is an apocalyptic number.

21422422 is a deficient number, since it is larger than the sum of its proper divisors (15301754).

21422422 is a wasteful number, since it uses less digits than its factorization.

21422422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530182.

The product of its digits is 512, while the sum is 19.

The square root of 21422422 is about 4628.4362370027. The cubic root of 21422422 is about 277.7300400216.

Adding to 21422422 its reverse (22422412), we get a palindrome (43844834).

The spelling of 21422422 in words is "twenty-one million, four hundred twenty-two thousand, four hundred twenty-two".