21370538 has 8 divisors (see below), whose sum is σ = 36635232. Its totient is φ = 9158796.

The previous prime is 21370537. The next prime is 21370549. The reversal of 21370538 is 83507312.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21370538.

It is not an unprimeable number, because it can be changed into a prime (21370537) 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, 763220 + ... + 763247.

It is an arithmetic number, because the mean of its divisors is an integer number (4579404).

Almost surely, 2^21370538 is an apocalyptic number.

21370538 is a deficient number, since it is larger than the sum of its proper divisors (15264694).

21370538 is a wasteful number, since it uses less digits than its factorization.

21370538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526476.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 21370538 is about 4622.8279223869. The cubic root of 21370538 is about 277.5056428255.

The spelling of 21370538 in words is "twenty-one million, three hundred seventy thousand, five hundred thirty-eight".