21303938 has 8 divisors (see below), whose sum is σ = 31980432. Its totient is φ = 10643796.

The previous prime is 21303917. The next prime is 21303943. The reversal of 21303938 is 83930312.

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 21303938.

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, 20 + ... + 6527.

It is an arithmetic number, because the mean of its divisors is an integer number (3997554).

Almost surely, 2^21303938 is an apocalyptic number.

21303938 is a deficient number, since it is larger than the sum of its proper divisors (10676494).

21303938 is a wasteful number, since it uses less digits than its factorization.

21303938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8176.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 21303938 is about 4615.6189184117. The cubic root of 21303938 is about 277.2170662761.

The spelling of 21303938 in words is "twenty-one million, three hundred three thousand, nine hundred thirty-eight".