21814272 has 110 divisors (see below), whose sum is σ = 65389368. Its totient is φ = 7243776.

The previous prime is 21814249. The next prime is 21814277. The reversal of 21814272 is 27241812.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21814277) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 82813 + ... + 83075.

Almost surely, 2^21814272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21814272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32694684).

21814272 is an abundant number, since it is smaller than the sum of its proper divisors (43575096).

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

21814272 is an equidigital number, since it uses as much as digits as its factorization.

21814272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295 (or 268 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 21814272 is about 4670.5751251853. The cubic root of 21814272 is about 279.4131928326.

The spelling of 21814272 in words is "twenty-one million, eight hundred fourteen thousand, two hundred seventy-two".