21226308 has 24 divisors (see below), whose sum is σ = 50867712. Its totient is φ = 6884064.

The previous prime is 21226291. The next prime is 21226321. The reversal of 21226308 is 80362212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23460 + ... + 24347.

It is an arithmetic number, because the mean of its divisors is an integer number (2119488).

Almost surely, 2^21226308 is an apocalyptic number.

It is an amenable number.

21226308 is an abundant number, since it is smaller than the sum of its proper divisors (29641404).

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

21226308 is a wasteful number, since it uses less digits than its factorization.

21226308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47851 (or 47849 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21226308 is about 4607.2017537764. The cubic root of 21226308 is about 276.8799368458.

The spelling of 21226308 in words is "twenty-one million, two hundred twenty-six thousand, three hundred eight".