21496224 has 24 divisors (see below), whose sum is σ = 56427840. Its totient is φ = 7165376.

The previous prime is 21496199. The next prime is 21496231. The reversal of 21496224 is 42269412.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 21496191 and 21496200.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111864 + ... + 112055.

It is an arithmetic number, because the mean of its divisors is an integer number (2351160).

Almost surely, 2^21496224 is an apocalyptic number.

21496224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21496224 is an abundant number, since it is smaller than the sum of its proper divisors (34931616).

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

21496224 is a wasteful number, since it uses less digits than its factorization.

21496224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223932 (or 223924 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 21496224 is about 4636.4020533168. The cubic root of 21496224 is about 278.0486087215.

The spelling of 21496224 in words is "twenty-one million, four hundred ninety-six thousand, two hundred twenty-four".