21352222 has 8 divisors (see below), whose sum is σ = 32358816. Its totient is φ = 10565952.

The previous prime is 21352217. The next prime is 21352223. The reversal of 21352222 is 22225312.

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 21352222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54838 + ... + 55225.

It is an arithmetic number, because the mean of its divisors is an integer number (4044852).

Almost surely, 2^21352222 is an apocalyptic number.

21352222 is a deficient number, since it is larger than the sum of its proper divisors (11006594).

21352222 is a wasteful number, since it uses less digits than its factorization.

21352222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110162.

The product of its digits is 480, while the sum is 19.

The square root of 21352222 is about 4620.8464592540. The cubic root of 21352222 is about 277.4263397815.

Adding to 21352222 its reverse (22225312), we get a palindrome (43577534).

The spelling of 21352222 in words is "twenty-one million, three hundred fifty-two thousand, two hundred twenty-two".