21700038 has 8 divisors (see below), whose sum is σ = 43400088. Its totient is φ = 7233344.

The previous prime is 21700001. The next prime is 21700039. The reversal of 21700038 is 83000712.

It is a sphenic number, since it is the product of 3 distinct primes.

21700038 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21699987 and 21700023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700039) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1808331 + ... + 1808342.

It is an arithmetic number, because the mean of its divisors is an integer number (5425011).

Almost surely, 2^21700038 is an apocalyptic number.

21700038 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21700038 is a wasteful number, since it uses less digits than its factorization.

21700038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3616678.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21700038 is about 4658.3299582576. The cubic root of 21700038 is about 278.9246080385.

The spelling of 21700038 in words is "twenty-one million, seven hundred thousand, thirty-eight".