21467224 has 16 divisors (see below), whose sum is σ = 40486320. Its totient is φ = 10670880.

The previous prime is 21467189. The next prime is 21467227. The reversal of 21467224 is 42276412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21467192 and 21467201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21467227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6372 + ... + 9139.

It is an arithmetic number, because the mean of its divisors is an integer number (2530395).

Almost surely, 2^21467224 is an apocalyptic number.

It is an amenable number.

21467224 is a deficient number, since it is larger than the sum of its proper divisors (19019096).

21467224 is a wasteful number, since it uses less digits than its factorization.

21467224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15690 (or 15686 counting only the distinct ones).

The product of its digits is 5376, while the sum is 28.

The square root of 21467224 is about 4633.2735727561. The cubic root of 21467224 is about 277.9235163887.

The spelling of 21467224 in words is "twenty-one million, four hundred sixty-seven thousand, two hundred twenty-four".