21370038 has 8 divisors (see below), whose sum is σ = 42740088. Its totient is φ = 7123344.

The previous prime is 21370033. The next prime is 21370039. The reversal of 21370038 is 83007312.

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

21370038 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21370031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1780831 + ... + 1780842.

It is an arithmetic number, because the mean of its divisors is an integer number (5342511).

Almost surely, 2^21370038 is an apocalyptic number.

21370038 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.

21370038 is a wasteful number, since it uses less digits than its factorization.

21370038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561678.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21370038 is about 4622.7738426187. The cubic root of 21370038 is about 277.5034785701.

The spelling of 21370038 in words is "twenty-one million, three hundred seventy thousand, thirty-eight".