21225606 has 8 divisors (see below), whose sum is σ = 42451224. Its totient is φ = 7075200.

The previous prime is 21225583. The next prime is 21225613. The reversal of 21225606 is 60652212.

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

21225606 is an admirable number.

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, 1768795 + ... + 1768806.

It is an arithmetic number, because the mean of its divisors is an integer number (5306403).

Almost surely, 2^21225606 is an apocalyptic number.

21225606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21225606 is a wasteful number, since it uses less digits than its factorization.

21225606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537606.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21225606 is about 4607.1255680739. The cubic root of 21225606 is about 276.8768844724.

Adding to 21225606 its reverse (60652212), we get a palindrome (81877818).

The spelling of 21225606 in words is "twenty-one million, two hundred twenty-five thousand, six hundred six".