21347824 has 10 divisors (see below), whose sum is σ = 41361440. Its totient is φ = 10673904.

The previous prime is 21347819. The next prime is 21347827. The reversal of 21347824 is 42874312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 667104 + ... + 667135.

It is an arithmetic number, because the mean of its divisors is an integer number (4136144).

Almost surely, 2^21347824 is an apocalyptic number.

It is an amenable number.

21347824 is a deficient number, since it is larger than the sum of its proper divisors (20013616).

21347824 is a wasteful number, since it uses less digits than its factorization.

21347824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334247 (or 1334241 counting only the distinct ones).

The product of its digits is 10752, while the sum is 31.

The square root of 21347824 is about 4620.3705479106. The cubic root of 21347824 is about 277.4072909471.

The spelling of 21347824 in words is "twenty-one million, three hundred forty-seven thousand, eight hundred twenty-four".