21224814 has 32 divisors (see below), whose sum is σ = 47706624. Its totient is φ = 6246240.

The previous prime is 21224813. The next prime is 21224821. The reversal of 21224814 is 41842212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4122 + ... + 7709.

It is an arithmetic number, because the mean of its divisors is an integer number (1490832).

Almost surely, 2^21224814 is an apocalyptic number.

21224814 is an abundant number, since it is smaller than the sum of its proper divisors (26481810).

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

21224814 is a wasteful number, since it uses less digits than its factorization.

21224814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11872.

The product of its digits is 1024, while the sum is 24.

The square root of 21224814 is about 4607.0396134611. The cubic root of 21224814 is about 276.8734406882.

The spelling of 21224814 in words is "twenty-one million, two hundred twenty-four thousand, eight hundred fourteen".