21226470 has 32 divisors (see below), whose sum is σ = 53160192. Its totient is φ = 5414112.

The previous prime is 21226453. The next prime is 21226481. The reversal of 21226470 is 7462212.

It is a self number, because there is not a number n which added to its sum of digits gives 21226470.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14692 + ... + 16071.

It is an arithmetic number, because the mean of its divisors is an integer number (1661256).

Almost surely, 2^21226470 is an apocalyptic number.

21226470 is an abundant number, since it is smaller than the sum of its proper divisors (31933722).

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

21226470 is a wasteful number, since it uses less digits than its factorization.

21226470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30796.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 21226470 is about 4607.2193349134. The cubic root of 21226470 is about 276.8806412302.

Adding to 21226470 its reverse (7462212), we get a palindrome (28688682).

The spelling of 21226470 in words is "twenty-one million, two hundred twenty-six thousand, four hundred seventy".