21224606 has 16 divisors (see below), whose sum is σ = 35214144. Its totient is φ = 9530784.

The previous prime is 21224591. The next prime is 21224617. The reversal of 21224606 is 60642212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10070 + ... + 11993.

It is an arithmetic number, because the mean of its divisors is an integer number (2200884).

Almost surely, 2^21224606 is an apocalyptic number.

21224606 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21224606 is a deficient number, since it is larger than the sum of its proper divisors (13989538).

21224606 is a wasteful number, since it uses less digits than its factorization.

21224606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22115.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21224606 is about 4607.0170392565. The cubic root of 21224606 is about 276.8725362458.

Adding to 21224606 its reverse (60642212), we get a palindrome (81866818).

The spelling of 21224606 in words is "twenty-one million, two hundred twenty-four thousand, six hundred six".