21224038 has 16 divisors (see below), whose sum is σ = 34804224. Its totient is φ = 9626760.

The previous prime is 21224023. The next prime is 21224053. The reversal of 21224038 is 83042212.

It is an interprime number because it is at equal distance from previous prime (21224023) and next prime (21224053).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15331 + ... + 16657.

It is an arithmetic number, because the mean of its divisors is an integer number (2175264).

Almost surely, 2^21224038 is an apocalyptic number.

21224038 is a deficient number, since it is larger than the sum of its proper divisors (13580186).

21224038 is a wasteful number, since it uses less digits than its factorization.

21224038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2067.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21224038 is about 4606.9553937498. The cubic root of 21224038 is about 276.8700663923.

The spelling of 21224038 in words is "twenty-one million, two hundred twenty-four thousand, thirty-eight".