21226888 has 16 divisors (see below), whose sum is σ = 39951360. Its totient is φ = 10573200.

The previous prime is 21226883. The next prime is 21226903. The reversal of 21226888 is 88862212.

It is not an unprimeable number, because it can be changed into a prime (21226883) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2728 + ... + 7063.

It is an arithmetic number, because the mean of its divisors is an integer number (2496960).

Almost surely, 2^21226888 is an apocalyptic number.

It is an amenable number.

21226888 is a deficient number, since it is larger than the sum of its proper divisors (18724472).

21226888 is a wasteful number, since it uses less digits than its factorization.

21226888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10068 (or 10064 counting only the distinct ones).

The product of its digits is 24576, while the sum is 37.

The square root of 21226888 is about 4607.2646982781. The cubic root of 21226888 is about 276.8824586991.

The spelling of 21226888 in words is "twenty-one million, two hundred twenty-six thousand, eight hundred eighty-eight".