21260222 has 8 divisors (see below), whose sum is σ = 32668272. Its totient is φ = 10370800.

The previous prime is 21260209. The next prime is 21260227. The reversal of 21260222 is 22206212.

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

It is a super-3 number, since 3×21260222³ (a number of 23 digits) contains 333 as substring.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21260222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21260227) 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, 129554 + ... + 129717.

It is an arithmetic number, because the mean of its divisors is an integer number (4083534).

Almost surely, 2^21260222 is an apocalyptic number.

21260222 is a deficient number, since it is larger than the sum of its proper divisors (11408050).

21260222 is a wasteful number, since it uses less digits than its factorization.

21260222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259314.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21260222 is about 4610.8808269137. The cubic root of 21260222 is about 277.0273185706.

Adding to 21260222 its reverse (22206212), we get a palindrome (43466434).

The spelling of 21260222 in words is "twenty-one million, two hundred sixty thousand, two hundred twenty-two".